A bunion is a deformity of the joint connecting the big toe to the foot.The big toe often bends towards the other toes and the joint becomes red and painful. Onset is gradual. Complications may include burditis or arthritis 

Symptoms: Prominent, red, and painful joint at the base of the big toe.

The exact cause is unclear. Proposed factors include wearing overly tight shoes, family history, and rheumatoid arthritis. Diagnosis is generally based on symptoms and supported by X-Ray. A similar condition of the little toe is referred to as a banionette.

Treatment may include proper shoes, orthodics or NSAID. If this is not effective for improving symptoms, surgery may be done. It affects about 23% of adults. Females are affected more often than males.  Usual age of onset is between 20 and 50 years old. The condition also becomes more common with age. It was first clearly described in 1870.