Hallux valgus is a deformity of the big toe, whereby the joint at the base of the toe projects outwards, and the top of the toe turns inwards. The condition is more common in women, and is associated with high heels. However, it can also be caused by an inherited joint weakness. It often leads to a bunion, or to osteoarthritis. Treatment is not normally required, unless the condition causes pain or limits foot movement. In this case, an osteotomy may be performed.

Anastasia Romanov suffered from hallux valgus on both of her big toes.