It is a very common foot problem as the heel is designed to provide a rigid support for the weight of the body. It is one of the prices we humans have to pay for our upright posture. So activities like walking and running place lot of stress on the foot ultimately damaging the heel which is the major pressure point.
Pain is usually mild and bearable. However, if early signs are ignored and strenuous activities are continued without precautions, it can get worse, turning into a chronic condition.