The bunion bone is a specific bone that is affected in the condition known as a bunion. A bunion is a bony bump that forms on the joint at the base of the big toe. It is caused by a misalignment of the bones in the foot, where the big toe pushes against the other toes, causing the joint to protrude outward. The bunion bone is the first metatarsal bone, which is located at the base of the big toe.
This misalignment causes the first metatarsal bone to move out of place, while the big toe angles toward the other toes, this is called hallux valgus. As the bunion progresses, the first metatarsal bone can become more prominent and the surrounding tissue, including the skin and the bursa, may become inflamed and painful. Treatment options for bunions include wearing comfortable shoes, orthotics, physical therapy, and in severe cases, surgery. Surgery may involve realigning the bones and tendons in the foot, removing bony growths, or straightening the toes.