A bunion is a painful deformity of the bones and joint between the foot and the big toe. Long-term irritation (chronic inflammation) from arthritis, poorly-fitting shoes, or heredity causes the joint to thicken and enlarge. This causes the bones of the big toe to angle in toward and over the second toe, the foot bone (metatarsal) to angle out toward the other foot, and the skin to thicken (callus formation).
Updated by: Thomas N. Joseph, MD, Private Practice specializing in Orthopaedics, subspecialty Foot and Ankle, Camden Bone & Joint, Camden, SC. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
Related MedlinePlus Page
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 1997-2015, A.D.A.M., Inc. Duplication for commercial use must be authorized in writing by ADAM Health Solutions.