These injuries are caused by stretching tissues beyond their normal range or by direct impact. Overuse foot injuries are common among recreational athletes. They include stress fractures, tendinitis, and bone and heel spurs. Other common problems are blisters, bunions, corns, calluses, athlete's foot, Morton's neuroma, and black and ingrown toenails. They may not cause injury during normal activity, but excessive sports activity will aggravate the problem or condition.
Some people naturally have little or no arch in their feet or have feet that turn in when they run.
These people tend to walk and run on the insides of their feet. This is called pronation. Pronating too much may cause overuse injuries such as stress fractures and tendinitis. It also makes the legs rotate inward. This can cause bursitis in the hip and pain in the kneecap.