A hammertoe is a common, minor toe deformity that affects one of your small digits. The middle joint of a small toe gets stuck in a cramped, bent position, so your digit looks somewhat like a hammer. This happens because of an imbalance between the muscles and tendons that keep your toe straight. One of the connectors tightens or shortens, keeping the joint stuck in a bent position. Often this happens because tight, poorly fitting shoes either cramp your digits or put pressure on your forefoot and strain the tendons attached to your toes. Other problems like arthritis, injuries, and even bunion deformities can contribute to this condition.