Why does my heel hurt first thing in the morning?

If your heel and the bottom of your foot hurts first thing in the morning when you get out of bed, or after you have been resting, you most likely have plantar fasciitis. 83.5% of patients with plantar fasciitis experience pain with their first steps in the morning. The injured tendon, the plantar fasica, tightens up when you are off of your feet. Getting up and stretching it out again is what causes the pain.