Bunion

A bunion is a deformity of the joint connecting the big toe to the foot and is known as a hallux abducto valgus among medical professionals. It is characterized by medial deviation of the first metatarsal bone and lateral deviation of the hallux (big toe), often erroneously described as an enlargement of bone or tissue around the joint at the bottom of the big toe (known as the metatarsophalangeal joint).

There is disagreement among medical professionals about the cause of bunions. Some see them as primarily caused by the long-term use of shoes, particularly tight-fitting shoes with pointed toes. Others believe that the problem stems from genetic factors that are exacerbated by shoe use. Bunions occur when pressure is applied to the side of the big toe (hallux) forcing it inwards towards, and sometimes under or over, the other toes (angulation). As pressure is applied, the tissues surrounding the joint may become swollen and tender. In a survey of people from cultures that do not wear shoes, no cases of bunions were found, lending credence to the hypothesis that bunions are caused by ill-fitting shoes.