This problem can begin in childhood and can be caused by hereditary abnormality in the alignment of the metatarsal bones and the joint excessively long.
However, it may occur in adulthood and is usually caused because the shoe does not fit properly. This problem is more common in people who use high heels, because the weight is distributed unevenly between the toes.
The hammertoe can also occur as a result of muscle and nerve deterioration that occurs for example in cases of diabetes, stroke, neurological disorders, by shortening the Achilles' heel or weakness of tibialis anterior, whose tendons cross the back foot. In many cases, this problem is associated with calli, arthritis and obesity.