A hammer toe is a bent toe that looks a little like a claw. It usually occurs to the second toe in from the big toe, but it can occur to any of the other toes as well. Hammer toes have limited movement and can be extremely painful in some cases. Poorly fitting shoes can exacerbate the pain, especially where the toe rubs the top of the shoe. This rubbing can lead to a callus, corn, or ulceration (an open sore) in extreme cases. Read more.