Bunions on the
big toe often begin when an abnormal foot motion called
excessive pronation transfers weight to the inner edge of the sole of the foot.
This and other factors, such as having
flatfoot and wearing tight-fitting shoes, can result
in too much pressure on the big toe (metatarsophalangeal) joint, causing the
big toe to bend in toward the smaller toes.
A bunion can affect
the other toes. As a result of the pressure of the big toe moving toward other
toes, you may develop: