||The examples and perspective in this article may not represent a worldwide view of the subject. (May 2011)|
A second opinion is an opinion on a matter disputed by two or more parties.
In cases such as car repairs, a second opinion should be obtained in writing, and the original garage given an opportunity to rectify matters. In the case of clients' disputes with domestic building contractors, the builder may seek a second opinion to confirm their view.
A second opinion can be visit to a physician other than the one a patient has previously been seeing in order to get more information or to hear a differing point of view. Some reasons for which a patient may seek out a second opinion include:
- Physician recommends surgery.
- Physician diagnoses patient with serious illness (such as cancer).
- Physician recommends a treatment for the patient other than what the patient believes is necessary.
- When physician recommends elective surgery, it may be required by the insurance plan. In other cases, insurance will not pay for a second opinion. 
- Patient believes he/she has a condition that the physician diagnosed incorrectly or failed to diagnose.
- The physician himself/herself recommends a second opinion.
Cancer Second Opinions - United Kingdom
Getting a second opinion about cancer treatment or diagnosis is relatively straight forward. The patient can ask their cancer specialist to refer them to another specialist or they can ask their General Practitioner (GP) to refer them or they can seek out a private second opinion.  Careful consideration should be taken when seeking an oncology second opinion, as delays in your treatment starting could alter the prognosis.
Second opinions may also be obtained by employers.
- Nancy F. Atlas; Stephen K. Huber; E. Wendy Trachte-Huber (2000). Alternative Dispute Resolution: The Litigator's Handbook. American Bar Association. p. 262. ISBN 978-1-57073-812-8.
- "Problems with the quality of garage repairs or service". Citizens Advice Bureau. CAB website. Retrieved 24 February 2014.
- "Handling customer complaints". QBCC website. Queensland Building and Construction Commission. Retrieved 20 April 2015.
- Kyle Beardsley (18 August 2011). The Mediation Dilemma. Cornell University Press. p. 37. ISBN 0-8014-5003-9.
- British Medical Association (31 January 2012). Medical Ethics Today: The BMA's Handbook of Ethics and Law. John Wiley & Sons. p. 253. ISBN 978-1-4443-5564-2.
- Lisa Granger (2010). Best Practices in Occupational Health, Safety, Workers Compensation and Claims Management for Employers: Assisting Employers in Navigating "The Road to Zero". Universal-Publishers. p. 159. ISBN 978-1-59942-812-3.
- Victoria Pynchon (10 April 2012). Success as a Mediator For Dummies. John Wiley & Sons. pp. 89–90. ISBN 978-1-118-07862-4.
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