Heel pain, medically termed plantar fasciitis, is a common and frustrating injury for many runners. It accounts for up to 10% of all running injuries and results from overstressing the band of tissue that connects the heel bone to the toes. If you suffer from plantar fasciitis, you probably experience sharp pain in your heel not only after running, but also with the first steps in the morning or after long periods of sitting or being on your feet.