Bunion

A bunion, also known as hallux valgus, is an outward deformity of the foot's metatarsophalangeal joint, which connects the big toe to the foot. The rear tarsometatarsal joint that holds the metatarsal bone in a straight-ahead position weakens, and the metatarsal moves outward and rotates, bringing the sesamoid bones up against the adjacent toe; this results in the head of the metatarsal bulging outward while the big toe bends inward toward the other toes. The joint often becomes red and painful from rubbing inside a cramped shoe, the onset is typically gradual, and complications may include bursitis or arthritis. A similar condition of the little toe is called a tailor's bunion or bunionette.