Bunions, corns, hammertoes and neuromas for the most part could be prevented by wearing comfortable shoes. The key is buying shoes that don't rub or squeeze five toes into a space that's too narrow, or that don't have a heel that puts all the weight on the front of your foot. Look at the shape of your foot and toes. Now look at the shape of your shoes - especially women. A hammertoe is a clawlike buckling of a toe, especially the second toe.
Bunions are a deformity of the big toe.
If the big toe is forced to curve toward the other toes, the joint becomes swollen, tender and permanently deformed. This causes a bone to protrude on the side of the foot. This bunion can be tender and cause pain underneath the big toe. Corns and calluses can develop from friction and extra pressure. Bunions, for the most part, develop gradually over years.