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Typical appearance of the back of the throat three days post tonsillectomy.
Other namesAdenotonsillectomy, T&A

Tonsillectomy is a surgical procedure in which both palatine tonsils are fully removed from the back of the throat.[1] The procedure is mainly performed for recurrent throat infections and obstructive sleep apnea (OSA).[1] For those with frequent throat infections, surgery results in fewer sore throats in the following one to two years, but unclear long term benefits.[1][2] In children with OSA it results in improved quality of life.[3]

While generally safe, complications of surgery may include bleeding, vomiting, trouble eating, and trouble talking.[1][4] Throat pain typically lasts about one to two weeks after surgery.[1][5] Bleeding occurs in about 1% within the first day and another 2% after that.[1] Death occurs as a result in between 1 in 2,360 and 56,000 procedures.[1] Following the surgery ibuprofen and paracetamol (acetaminophen) may be used to treat postoperative pain.[1] The surgery is often done using metal instruments or electrocautery.[1][6] The adenoid may also be removed in which case it is known as an "adenotonsillectomy".[1] The partial removal of the tonsils is called a "tonsillotomy".[1]

The surgery has been described since at least as early as 50 AD by Celsus.[7] In the United States, as of 2010, tonsillectomy is performed less frequently than in the 1970s although it remains the second most common outpatient surgical procedure in children.[1] The typical cost when done as an inpatient in the United States is US$4,400 as of 2013.[8]

Medical uses[edit]

Tonsillectomy is mainly undertaken for sleep apnea and recurrent or chronic tonsillitis.[1] It is also carried out for peritonsillar abscess, periodic fever, aphthous stomatitis, pharyngitis and adenitis (PFAPA), guttate psoriasis, nasal airway obstruction, tonsil cancer and diphtheria carrier state. For children, tonsillectomy is usually combined with the removal of the adenoid.

Sore throat[edit]

Surgery is not recommended for those with fewer than 7 throat infections in the last year, fewer than 5 each year for the last 2 years, or fewer than 3 each year for 3 years.[1]

In children with recurrent tonsilitis the benefit of tonsillectomy is modest with evidence only supporting benefit in the first one to two years.[2][1] Children who undergo surgery on average have one fewer sore throat per year in the subsequent one or two years, compared to those who do not.[1][2][9] Specifically one review found a decrease from 3.6 to 3.0 episodes in the year following surgery.[2] Those with frequent throat infections often improve over a year without surgery.[1] Evidence in adults is unclear.[2]

The American Academy of Otolaryngology & Head and Neck Surgery (AAO-HNS) guideline in 2011 states tonsillectomy indicated the following:

Clinicians may recommend tonsillectomy for recurrent throat infection with a frequency of at least 7 episodes in the past year or at least 5 episodes per year for 2 years or at least 3 episodes per year for 3 years with documentation in the medical record for each episode of sore throat and one or more of the following: temperature >38.3 °C, cervical adenopathy, tonsillar exudates, or positive test for Group A Beta- hemolytic strep.[10]

The panel also recommended:

  1. Watchful waiting for recurrent throat infection if there have been fewer than 7 documented episodes in the past year or fewer than 5 episodes per year in the past 2 years or fewer than 3 episodes per year in the past 3 years;
  2. Assessing the child with recurrent throat infection who does not meet criteria in statement 2 for modifying factors that may nonetheless favor tonsillectomy, which may include but are not limited to multiple antibiotic allergy/intolerance, periodic fever, aphthous stomatitis, pharyngitis and adenitis, or history of peritonsillar abscess;
  3. Asking caregivers of children with sleep-disordered breathing and tonsil hypertrophy about comorbid conditions that might improve after tonsillectomy, including growth retardation, poor school performance, enuresis, and behavioral problems;
  4. Counseling caregivers about tonsillectomy as a means to improve health in children with abnormal polysomnography who also have tonsil hypertrophy and sleep-disordered breathing;
  5. Counseling caregivers that sleep-disordered breathing may persist or recur after tonsillectomy and may require further management;
  6. Advocating for pain management after tonsillectomy and educating caregivers about the importance of managing and reassessing pain; and
  7. Clinicians who perform tonsillectomy should determine their rate of primary and secondary post-tonsillectomy hemorrhage at least annually.

Obstructive sleep apnea[edit]

Tonsillectomy improves obstructive sleep apnea (OSA) in most children.[1] A 2015 Cochrane review found moderate quality evidence for benefits in terms of quality of life and symptoms but no benefit in attention or academic performance.[3] It recommended that physicians and parents should weigh the benefits and risks of surgery as OSA symptoms may spontaneously resolve over time.[3] An AHRQ review however did find improvements at school.[1] The procedure is recommended for those who have OSA that has been verified by a sleep study.[1]


The evidence for other uses such as tonsil stones, bad breath, trouble swallowing, and an abnormal voice is less strong.[1]


While generally safe, tonsillectomy may result in several complications, some of which are serious.[2][4] Complications of surgery may include vomiting, trouble eating, trouble talking, tongue swelling, damage to structures of the mouth, cardiac arrest and bleeding.[1] Throat pain typically lasts about one to two weeks after surgery.[1][6] Bleeding after tonsillectomy affects about 4% of children.[11] Bleeding occurs in about 1% within the first day and another 2% after that.[1] Delayed discharge occurs in about 1% of and around 4% of people are readmitted.[1] Death occurs as a result in between 1 in 2,360 and 56,000 procedures.[1]

As the procedure is done under general anesthesia, there are anesthesia risks.[1]

Immune system[edit]

Tonsillectomy does not appear to affect long term immune function.[1][12] It does not appear to affect the long term risk of infections in other areas of the body.[13] Some studies have found small changes in immunoglobulin concentrations after tonsillectomy but these are of unclear significance.[1] The association between tonsillectomy and risk for inflammatory bowel disease (e.g., Crohn's disease or ulcerative colitis) is unclear.[14][15][16] There is an association suggesting an increase in the risk of developing multiple sclerosis if done before the age of 20.[17][18]

Surgical procedure[edit]

Cryptic tonsils immediately following surgical removal (bilateral tonsillectomy).
Throat 1 day after a tonsillectomy.
Throat some days after a tonsillectomy.

For the past 50 years at least, tonsillectomy has been performed by dissecting the tonsil from its surrounding fascia, a so-called total, or extra-capsular tonsillectomy. Problems including pain and bleeding led to a recent resurgence in interest in sub-total tonsillectomy or tonsillotomy, which was popular 60–100 years ago, in an effort to reduce these complications.[19] The generally accepted procedure for 'total' tonsillectomy uses a scalpel and blunt dissection or electrocautery, although harmonic scalpels or lasers have also been used. Bleeding is stopped with electrocautery, ligation by sutures, and the topical use of thrombin, a protein that induces blood clotting.

It is not known whether the benefits of subtotal tonsillectomy in obstructive sleep apnea are enduring. But this is also the case for tonsillectomy for sleep apnea. There have been no randomised controlled trials of long term effectiveness of tonsillectomy for sleep apnea.[3]

Methods of tonsillectomy[edit]

The scalpel is the preferred surgical instrument of many ear, nose, and throat specialists. However, there are other techniques and a brief review of each follows:

  • Dissection and snare method: Removal of the tonsils by use of a forceps and scissors with a wire loop called a snare was formerly the most common method practiced by otolaryngologists, but has been largely replaced in favor of other techniques.[citation needed] The procedure requires the patient to undergo general anesthesia; the tonsils are completely removed and the remaining tissue surface is cauterized. The patient will leave with minimal post-operative bleeding.
  • Electrocautery: Electrocautery uses electrical energy to separate the tonsillar tissue and assists in reducing blood loss through cauterization. Research has shown that the heat of electrocautery (400 °C) may result in thermal injury to surrounding tissue. This may result in more discomfort during the postoperative period.
  • Radiofrequency ablation: Monopolar radiofrequency thermal ablation transfers radiofrequency energy to the tonsil tissue through probes inserted in the tonsil. The procedure can be performed in an office (outpatient) setting under light sedation or local anesthesia. After the treatment is performed, scarring occurs within the tonsil causing it to decrease in size over a period of several weeks. The treatment can be performed several times. The advantages of this technique are minimal discomfort, ease of operations, and immediate return to work or school. Tonsillar tissue remains after the procedure but is less prominent. This procedure is recommended for treating enlarged tonsils and not chronic or recurrent tonsillitis.
  • Coblation tonsillectomy: This surgical procedure is performed using plasma to remove the tonsils. Coblation technology combines radiofrequency energy and saline to create a plasma field. The plasma field is able to dissociate molecular bonds of target tissue while remaining relatively cool (40-70 °C),[20] which results in minimal or no damage to surrounding healthy tissue. A Coblation tonsillectomy is carried out in an operating room setting, with the patient under general anesthesia. Tonsillectomies are generally performed for two main reasons: tonsillar hypertrophy (enlarged tonsils) and recurrent tonsillitis. It has been claimed that this technique results in less pain, faster healing, and less post operative care.[21] However, review of 21 studies gives conflicting results about levels of pain, and its comparative safety has yet to be confirmed.[22] This technique has been criticized for a higher than expected rate of bleeding presumably due to the low temperature which may be insufficient to seal the divided blood vessels but several papers offer conflicting (some positive, some negative) results. More recent studies of coblation tonsillectomy indicate reduced pain and ostalgia;[23] less intraoperative or postoperative complications;[24] lesser incidence of delayed hemorrhage, more significantly in pediatric populations,[25][26][27] less postoperative pain and early return to daily activities, fewer secondary infections of the tonsil bed and significantly lower rates of secondary hemorrhage.[28] Unlike the electrosurgery procedure, Coblation Tonsillectomy generates significantly lower temperatures on contacted tissue.[29] Long term studies seem to show that surgeons experienced with the technique have very few complications.
  • Harmonic scalpel: This medical device uses ultrasonic energy to vibrate its blade at 55kHz. Invisible to the naked eye, the vibration transfers energy to the tissue, providing simultaneous cutting and coagulation. The temperature of the surrounding tissue reaches 80 °C. Proponents of this procedure assert that the end result is precise cutting with minimal thermal damage.
  • Thermal Welding: A new technology which uses pure thermal energy to seal and divide the tissue. The absence of thermal spread means that the temperature of surrounding tissue is only 2-3 °C higher than normal body temperature. Clinical papers show patients with minimal post-operative pain (no requirement for narcotic pain-killers), zero edema (swelling) plus almost no incidence of bleeding. Hospitals in the US are advertising this procedure as "Painless Tonsillectomy". Also known as Tissue Welding.
  • Carbon dioxide laser: When a laser is used to perform tonsillectomy, it can be under local anaesthetic with anaesthetic spray only, called tonsillotomy (or tonsil resurfacing), or it can be performed under general anaesthetic when it is called intra-capsular tonsillectomy, using an operating microscope for magnification. The carbon dioxide laser in scanning mode is an excellent vapouriser of tissue, and in conjunction with a computerised pattern generator and operating microscope with micromanipulator, it can result in near total removal of tonsil tissue whilst preserving the capsule of the tonsil. This leads to a significantly reduced bleeding and pain rate.[30] The local anaesthetic technique takes around 10 minutes, the general around 20 minutes depending on the size of the tonsils - the bigger they are, the longer it takes. The general anaesthetic operation has a revision rate of 1:50, the local anaesthetic tonsillotomy 1:4.5. This is different from procedures where a laser is used to reduce or resurface the tonsils (e.g. laser cryptolysis). Providing the absence of certain contra-indications such as sensitive gag reflex, LAST can be performed under local anesthetic as an outpatient procedure. A carbon dioxide laser is commonly used, and is swept over each tonsil 8–10 times. The smoke is aspirated out of the mouth to prevent smoke inhalation. Often, more than one procedure is required, each lasting about 20 minutes. Due to the frequent requirement for multiple sessions, this treatment may work out more expensive than a single session tonsillectomy. A degree of patient compliance is required, making it unsuitable for young children and anxious persons, who risk harm if they move during the procedure.[31]
  • Microdebrider: The microdebrider is a powered rotary shaving device with continuous suction often used during sinus surgery. It is made up of a cannula or tube, connected to a hand piece, which in turn is connected to a motor with foot control and a suction device. The endoscopic microdebrider is used in performing a partial tonsillectomy, by partially shaving the tonsils. This procedure entails eliminating the obstructive portion of the tonsil while preserving the tonsillar capsule. A natural biologic dressing is left in place over the pharyngeal muscles, preventing injury, inflammation, and infection. The procedure results in less post-operative pain, a more rapid recovery, and perhaps fewer delayed complications. However, the partial tonsillectomy is suggested for enlarged tonsils—not those that incur repeated infections.[citation needed]


A single dose of the corticosteroid drug dexamethasone may be given during surgery to prevent post-operative vomiting.[32] A dose of dexamethasone during surgery prevents vomiting in one out of every five children.[32] Children also return to a normal diet more quickly and have less post-operative pain.[32]

Post-surgery care[edit]

A sore throat will persist approximately two weeks following surgery while pain following the procedure is significant and may necessitate a hospital stay.[33] Recovery can take from 7 to 10 days and proper hydration is very important during this time, since dehydration can increase throat pain, leading to a circle of poor fluid intake.[34][35] Tonsillectomy appears to be more painful in adults than children.[36]

At some point, most commonly 7–11 days after the surgery (but occasionally as long as two weeks (14 days) after), bleeding can occur when scabs begin sloughing off from the surgical sites. The overall risk of bleeding is approximately 1–2%. It is higher in adults, especially males over age 70 and three quarters of bleeding incidents occur on the same day as the surgery.[37] Approximately 3% of adults develop bleeding at this time which may sometimes require surgical intervention.

Recommendations for pain management include ibuprofen and paracetamol (acetaminophen).[1] The opioid codeine is not recommended for those less than 12 years old.[1] There is a theoretical concern that NSAIDs may increase the risk of bleeding but evidence does not support such a risk.[38]

Tonsillectomy rates[edit]

There are significant variations in tonsillectomy rates, both between and within countries. As it is unlikely that recurrent sore throats vary in frequency between countries it suggests that many tonsillectomies may in fact be done without sufficient medical justification.[2]The Dartmouth Atlas of Health Care.</ref> In 2015, tonsillectomy rates in the Netherlands, Belgium, Finland and Norway were at least twice those in the UK but rates in Spain, Italy and Poland were at least a quarter lower.[39] Childhood tonsillectomy rates in the USA are among the highest in the world and are three times higher than in England.[2][40] Tonsillectomy rates vary considerably between even quite similar countries: rates are three times higher in Croatia than Slovenia.[39]

A 2010 study in England found the annual tonsillectomy rate per 100,000 between 2000 and 2005 was 754 in the highest region, the national average was 304 and the lowest region was 102. This means there is a seven-fold difference between the region with the highest tonsillectomy rate and the region with the lowest one.[41] In 2006, Chief Medical Officer Liam Donaldson revealed that unnecessary tonsillectomies and unnecessary hysterectomies combined cost the British National Health Service 21 million Pounds a year.[42]


In 2018, a study of the medical records of 1,630,807 UK children found 15,760 had sufficient sore throats to justify tonsillectomy, but only 13.6% (2144) underwent surgery. This means that even in children who experience frequent, severe sore throats, the vast majority do not undergo tonsillectomy, suggesting it is not essential even in severely affected children. The same study found 18,281 children who had undergone tonsillectomy, but of these only 11.7% (2144) had evidence-based indications (i.e. frequent enough sore throats to justify surgery). This did not change over 12 years from 2005 to 2016. The vast majority of tonsillectomies were undertaken for indications which did not have an evidence-base: five to six sore throats in one year (12.4%), two to four sore throats in one year (44.6%), sleep disordered breathing (12.3%), or obstructive sleep apnoea (3.9%).[43] In the UK therefore, most children who undergo tonsillectomy probably do not benefit and most children who might benefit do not undergo tonsillectomy. The study says that 32,500 out of the 37,000 children who have their tonsils removed annually "are unlikely to benefit". No similar study has been undertaken in any other country. Therefore, it is not known if the situation is better or worse elsewhere. However tonsillectomy rates are lower in the UK than in many countries including the USA,[40] the Netherlands and Germany.[39]

Table: Numbers of children (from 1.6 million children between 2005 and 2016 in the UK) identified with possible indications for tonsillectomy and the numbers who subsequently undergo tonsillectomy.

Condition which might be considered an indication for tonsillectomy Number of children
consulting with
this indication
Proportion with
this indication
Proportion of all
attributable to
this indication
Tonsillar tumour 5 0% 0.0%
Aphthous stomatitis, pharyngitis & cervical adenitis syndrome 435 3.4% 0.1%
Paradise criteria 15,320 13.9% 11.6%
Obstructive sleep apnoea 3,185 22.2% 3.9%
Other sleep disordered breathing 15,205 14.8% 12.3%
Peritonsillar abscess 675 14.8% 0.5%
Recurrent sore throats / tonsillitis (episodes per year):
  5 to 6 25,420 8.9% 12.4%
  3 to 4 170,687 3.2% 30.1%
  2 to 4 with guttate / chronic psoriasis 939 3.7% 0.2%
 2 to 4 with glomerulonephritis 148 4.7% 0.0%
 2 251,247 1% 14.3%
  1 446,275 0.4% 9.9%
No indication identified 701,266 0.1% 4.7%
Total 1,630,807 1.1% 100.0%

Source: Šumilo et al. 2018[43]

Financial incentives[edit]

It is a well known fact that, in general, surgeons who are paid fee-for-service reimbursements, are more inclined to perform surgery and therefore perform unnecessary surgery more often than surgeons who are paid a fixed salary.[44][45] For example, in 1968 a Canadian study pointed out that ENT specialists working on a fee-for-service programme were twice as likely to perform a tonsillectomy than those who were not.[46]

Tonsillectomy can be considered as an industry with a market. In the USA there are 530,000 childhood tonsillectomies annually.[40] At an average of $3500 per operation this is an industry worth $1.855 billion yearly.[47] The rise in adenotonsillectomies for sleep apnoea in the USA has been much greater than the decline in tonsillectomies for sore throat.[48] This means that the tonsillectomy industry continues to grow, despite limited evidence that tonsillectomy confers significant benefits and increasing concerns in relation to long term safety. In 2009 US President Obama even remarked:

Right now, doctors, a lot of times, are forced to make decisions based on the fee payment schedule that's out there. So if they're looking and -- and you come in and you've got a bad sore throat, or your child has a bad sore throat, or has repeated sore throats, the doctor may look at the reimbursement system and say to himself, "You know what? I make a lot more money if I take this kid's tonsils out." Now, that may be the right thing to do. But I'd rather have that doctor making those decisions just based on whether you really need your kid's tonsils out or whether it might make more sense just to change -- maybe they have allergies. Maybe they have something else that would make a difference.[49]

Parental pressure[edit]

Parental pressure has played a role in the decisions of general practitioners and ENT specialists regarding tonsillectomy over the past decades.[50][51][52][53][54][55]

For example, in 1948 a British aurist wrote in a letter to the British Medical Journal:

[It] would be disastrous to leave the decision to the parents. Anybody with experience in school tonsil clinics knows that parents who bring their children very often say: "I want my child's tonsils removed" and are more than displeased when told that tonsillectomy is not advised.[56]

Six years later, in 1954, British family doctor Oliver Plowright said something similar:

One of the difficulties we doctors are up against is that in assessing the effects on the child both of the affected tonsils and of their removal, we are considerably dependent on the opinion of the parents. Quite unjustifiably, the operation for removal of the tonsils has achieved a tremendous reputation among parents who will badger us until, in desperation, we are forced to agree that "Perhaps they had better come out after all."[57]

In 1957 an English general practitioner who was very sceptical towards tonsillectomy, reported that of the 40 children of his practice who had their tonsils removed, 6 (15%) had the procedure done because of "parental pressure that could not be resisted".[58] Four years later, in 1961, English paediatrician Ronald Illingworth commented:

The operation should never be performed because the parents want it, the doctor wants it, or a school nurse, aunt or grandmother wants it. The child alone is the one who matters.[50]

In the same year, an English ENT specialist remarked:

It is difficult to persuade parents and practitioners that the tonsil has other functions than just to be taken out when large.[50]

In 2003, British otolaryngologist Martin Burton concluded:

Armed with an understanding of the natural history of recurrent tonsillitis, details of the management options available and information about the nature and risks of surgery, the appropriately counselled parents can make a decision with and on behalf of their own child. Many of them elect for surgery. But we should not delude ourselves that this decision is made on the basis of anything they have been told during the counselling process. I suspect that in many cases the decision has been made before the consultation with the specialist, perhaps even before the consultation with the general practitioner. In many quarters the "word on the street" is still this—"if you’re having trouble with your throat, you should have your tonsils out." Fashions may change capriciously; tenets in popular culture are harder to dispel.[59]

Parental pressure has also been reported in Canada. In 1972, Canadian ENT specialist Dr. Simon McGrail wrote:

As size is perhaps the commonest indication for surgery so far as the child's parents are concerned, the physician must be firm in resisting what may be very strong pressure from an anxious mother or father. Size is rarely an indication in itself for removal.


The T and A operation has no apparent place in (...) particularly parental pressures with such indications as a brother or sister already booked on a certain day, or because "Johnny is now seven years old".[60]

In 1974, two Canadian researchers recommended:

The time has come when we should weigh the practice against the results. Too often physicians scheduled [adenotonsillectomies] out of habit or in response to parental pressure.[55]

Three years later, Canadian family physician Nancy Naylor remarked:

Parents often ask: "Doctor, his tonsils are so large! Don't you think he should have them out?"[61]

Compared to other countries, tonsillectomy rates have always been high in the Netherlands and remain one of the highest in the world, which according to Dutch ENT specialist Anne Schilder is because of cultural reasons.[39][62] In 1964 a Dutch ENT specialist commented that once a child has benefited from the procedure, its parents often urge to have the procedure done on their other children, even without any medical indication, and that doctors should strongly resist that urge.[63] According to a document written in 2008 by the umbrella organization of ten health insurers in The Netherlands, many unnecessary tonsillectomies are still performed because of parental demand.[64]

In 1995 an Israeli ENT surgeon reported that of the 90 the children he examined, 17 times (19%) the mother was "enthusiastic for surgery".[65]

In 2012, a US paediatric intensive care physician wrote in his blog:

I've met dozens of parents who say their child (or themselves as children) had constant strep infections until the tonsils came out. Often these same parents (and especially their grandparents) had had their tonsils out as children and more or less regarded tonsillectomy as something children need, like vaccinations.[66]


Tonsil guillotine.

Tonsillectomies have been practiced for over 2,000 years, with varying popularity over the centuries.[67] The procedure is claimed in some books as "Hindu medicine" about 1000 BCE (non-evidence based literature). Others refer to it as cleaning of tonsil using the nail of the index finger. Roughly a millennium later the Roman aristocrat Aulus Cornelius Celsus (25 BCE – 50 CE) described a procedure whereby using the finger (or a blunt hook if necessary), the tonsil was separated from the neighboring tissue before being cut out.[67] Galen (121–200 CE) was the first to advocate the use of the surgical instrument known as the snare, a practice that was to become common until Aetius (490 CE) recommended partial removal of the tonsil, writing "Those who extirpate the entire tonsil remove, at the same time, structures that are perfectly healthy, and, in this way, give rise to serious Hæmorrhage".[67] In the 7th century Paulus Aegineta (625–690) described a detailed procedure for tonsillectomy, including dealing with the inevitable post-operative bleeding. 1,200 years pass before the procedure is described again with such precision and detail.[67]

The Middle Ages saw tonsillectomy fall into disfavor; Ambroise Pare (1509) wrote it to be "a bad operation" and suggested a procedure that involved gradual strangulation with a ligature. This method was not popular with the patients due to the immense pain it caused and the infection that usually followed. Scottish physician Peter Lowe in 1600 summarized the three methods in use at the time, including the snare, the ligature, and the excision.[67] At the time, the function of the tonsils was thought to be absorption of secretions from the nose; it was assumed that removal of large amounts of tonsillar tissue would interfere with the ability to remove these secretions, causing them to accumulate in the larynx, resulting in hoarseness. For this reason, physicians like Dionis (1672) and Lorenz Heister censured the procedure.[citation needed]

In 1828, physician Philip Syng Physick modified an existing instrument originally designed by Benjamin Bell for removing the uvula; the instrument, known as the tonsil guillotine (and later as a tonsillotome), became the standard instrument for tonsil removal for over 80 years.[67] By 1897, it became more common to perform complete rather than partial removal of the tonsil after American physician Ballenger noted that partial removal failed to completely alleviate symptoms in a majority of cases. His results using a technique involving removal of the tonsil with a scalpel and forceps were much better than partial removal; tonsillectomy using the guillotine eventually fell out of favor in America.[67] During the 1940s and 1950s, several studies found an association between tonsillectomy and poliomyelitis with recommendations not to do the operation during outbreaks.[68]


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External links[edit]

Media related to Tonsillectomy at Wikimedia Commons