A heel spur is a build up of calcium which occurs from excessive activity such as running, jumping, or doing heavy lifting. This can create a tremendous amount of strain on the fascia tissue which can cause inflammation, and resulting in a pulling away from the heel bone. Heel spurs can be extremely painful when you are standing or walking on an inflamed area. Stretching exercises are beneficial in that they help to keep the fascia and the surrounding tissues strengthened.
Heel spurs are very often interchanged with the condition called plantar fasciitis, but heel spurs can develop in other areas, for example, on the back of the heel not just at the front and bottom of the heel.