|Classification and external resources|
Endoscopy image of gastric foreign body (toothbrush)
|ICD-9||930-939 , 919.6|
A foreign body (Latin: corpus alienum) is any object originating outside the body. In machinery, it can mean any unwanted intruding object.
Most references to foreign bodies involve propulsion through natural orifices into hollow organs.
Foreign bodies can be inert or irritating. If they irritate they will cause inflammation and scarring. They can bring infection into the body or acquire infectious agents and protect them from the body's immune defenses. They can obstruct passageways either by their size or by the scarring they cause. Some can be toxic.
Both children and adults experience problems caused by foreign objects getting stuck in their bodies. Young children, in particular, are naturally curious and may intentionally put shiny objects, such as coins or button batteries, into their mouths. They also like to stick things in their ears and up their noses. The effect of a foreign body can be very different. For example, a coin causes local pressure on the tissue but generally, is not a medical emergency to remove. A button battery, which can be a very similar size to a coin, generates hydroxide ions at the anode and causes a chemical burn in 2 hours. An ingested button battery that is stuck in the esophagus is a medical emergency. In 2009, Avolio Luigi and Martucciello Giuseppe showed that although ingested nonmagnetic foreign bodies are likely to be passed spontaneously without consequence, ingested magnets (magnetic toys) may attract each other through children's intestinal walls and cause severe damage, such as pressure necrosis, perforation, intestinal fistulas, volvulus, and obstruction.
Alimentary tract 
One of the most common locations for a foreign body is the alimentary tract.
It is possible for foreign bodies to enter the tract from the mouth, or from the rectum.
In one study, peanuts were the most common obstruction. In addition to peanuts, hot dogs, and grapes, latex balloons are also a serious choking hazard in children that can result in death. A latex balloon will conform to the shape of the trachea, blocking the airway and making it difficult to expel with the Heimlich maneuver.
Airborne particles can lodge in the eyes of people at any age. These foreign bodies often result in allergies which are either temporary or even turn into a chronic allergy. This is especially evident in the case of dust particles.
With sufficient force (as in firing of bullets), a foreign body can become lodged into nearly any tissue. Splinters are common foreign bodies in skin. Staphylococcus aureus infection often causes boils to form around them.
Foreign bodies can also become lodged in other locations:
In other animals 
Foreign bodies are common in animals, especially dogs and cats. Dogs will readily eat toys, bones, and any object that either has food on it or retains the odor of food. Unlike humans, dogs are susceptible to gastrointestinal obstruction due to their ability to swallow relatively large objects and pass them through the esophagus. Foreign bodies most commonly become lodged in the stomach because of the inability to pass through the pyloric sphincter, and in the jejunum. Symptoms of gastrointestinal obstruction include vomiting, abdominal pain, and depression due to dehydration. Peritonitis results if either the stomach or intestine has ruptured. Foreign bodies in the stomach can sometimes be removed by endoscopic retrieval or if necessary by gastrotomy. Foreign bodies in the jejunum are removed by enterotomy.
Certain foreign bodies in animals are especially problematic. Bones or objects with sharp edges may cause tearing of the wall of the esophagus, stomach, or small intestine and lead to peritonitis. Pennies swallowed in large numbers may cause zinc poisoning, which in dogs leads to severe gastroenteritis and hemolytic anemia. Linear foreign bodies can especially be dangerous. A linear foreign body is usually a length of string or yarn with a larger object or clump of material at either end. One end is usually lodged in the stomach or proximal small intestine and the other end continues to travel through the intestines. The material becomes tightly stretched and the intestines may "accordion up" on themselves or be lacerated by it. This is especially common in cats who may enjoy playing with a ball of string or yarn. Sometimes the linear foreign body anchors in the mouth by catching under the tongue. Pantyhose is a common linear foreign body in dogs.
See also 
- "Foreign Bodies: Nose and Paranasal Sinus Disorders: Merck Manual Professional". Retrieved 2008-12-16.
- Litovitz, Toby. "Swallowed a Button Battery?". National Capital Poison Center. Retrieved 11 June 2011.
- Avolio L, Martucciello G.(2009 Jun)."Images in clinical medicine. Ingested magnets".N Engl J Med. 25;360(26):2770
- "Foreign Body Aspiration: Overview - eMedicine". Retrieved 2008-12-16.
- Yadav SP, Singh J, Aggarwal N, Goel A (September 2007). "Airway foreign bodies in children: experience of 132 cases". Singapore Med J 48 (9): 850–3. PMID 17728968.
- Muntz, Harlan (2009). Pediatric Otolaryngology for the Clinician: Foreign Body Management. Humana Press. pp. 215–222. ISBN 978-1-58829-542-2.
- "Foreign Body, Intraocular: Overview - eMedicine". Retrieved 2008-12-16.
- Fisher, Bruce; Harvey, Richard P.; Champe, Pamela C. Lippincott's Illustrated Reviews: Microbiology (Lippincott's Illustrated Reviews Series). Hagerstown, MD: Lippincott Williams & Wilkins. ISBN 0-7817-8215-5.
- Halaas GW (September 2007). "Management of foreign bodies in the skin". Am Fam Physician 76 (5): 683–8. PMID 17894138.
- Thompson SK, Wein RO, Dutcher PO (November 2003). "External auditory canal foreign body removal: management practices and outcomes". Laryngoscope 113 (11): 1912–5. doi:10.1097/00005537-200311000-00010. PMID 14603046.
- "Foreign Body, Nose". Retrieved 2008-12-16.
- "Foreign Body, Vagina". Retrieved 2008-12-16.
- Rahman, N. U.; Elliott, S. P.; McAninch, J. W. (2004). "Self-inflicted male urethral foreign body insertion: endoscopic management and complications". BJU International 94 (7): 1051–1053. doi:10.1111/j.1464-410X.2004.05103.x. PMID 15541127.
- About.com: http://www.peteducation.com/article.cfm?cls=0&cat=1765&articleid=1181
- Glossary Term: Linear Foreign Body
- Case report of Foreign Body Ingestion. Clinical Cases and Images.
- The Susy Safe Project. A Surveillance System on Suffocation Injuries due to Foreign Bodies in European Children.