Pain in the bottom of the heel is often caused by plantar fasciitis. The key to treating plantar fasciitis is to figure out the root cause of why the plantar fascia is painful to begin with. This condition can be caused by many different factors including flexibility, strength, the range of motion, and potentially a problem in the back. Plantar fasciitis can affect runners and people who stand on their feet a lot during the day. Watch this video below to learn more.