From Jonathan Cluett, M.D.,
Your Guide to Orthopedics.
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About.com Health's Disease and Condition content is reviewed by Kate Grossman, MD

Definition: Bunions are a common problem that most people experience as a bony protuberance at the base of the big toe. The problem, however, is more complicated than simply a bump. The most common cause of bunions is due to the big toe angling in towards the other toes, a condition called hallux valgus. Bunions are most common in women, and the cause is usually wearing unsuitable footwear.

Shoes such as high heels are particularly damaging. These shoes have a sloping foot piece and a narrow toe box. The slope causes the front of the foot to be pushed with force into the narrow toe box. Patients can also be genetically predisposed to this problem, a condition called metatarsus primus varus.

For more information: Bunions

Also Known As: Hallux Valgus