Plantar fasciitis is a common (very) painful disorder affecting the heel and underside of the foot. It is a disorder of the insertion site of ligament on the bone and is characterized by scarring, inflammation, or structural breakdown of the foot’s plantar fascia. It is often caused by overuse injury of the plantar fascia, increases in exercise, weight or age.
[ Read More http://en.wikipedia.org/wiki/Plantar_fasciitis ]
This link has lots of pictures and is worth looking at, especially anyone who has sore feet.
New Techniques For Treating Plantar Fasciitis By Thomas C. Michaud, D.C., Published Jun. 6, 2014, Updated Jun. 8, 2014 at 6:11 AM UTC