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Heel spurs occur when calcium deposits build up on the underside of the heel bone, a process that usually occurs over a period of many months. Heel spurs are often caused by strains on foot muscles and ligaments, stretching of the plantar fascia, and repeated tearing of the membrane that covers the heel bone. Heel spurs are especially common among athletes whose activities include large amounts of running and jumping. Risk factors for heel spurs include: 1  Walking gait abnormalities,which place excessive stress on the heel bone, ligaments, and nerves near the heel. 2  Running or jogging, especially on hard surfaces. 3  Poorly fitted or badly worn shoes, especially those lacking appropriate arch support. 4  Excess weight and obesity.
A heel spur is a hook of bone that can form on the heel bone (calcaneus) and is associated with plantar fasciitis. About 70 percent of patients with plantar fasciitis have a heel spur that can be seen on an X-ray. However, many patients without symptoms of pain can have a heel spur. The exact relationship between plantar fasciitis and heel spurs is not entirely understood. The heel spur itself is not likely the primary cause of pain, rather inflammation and irritation of the plantar fascia is thought to be the major contributing factor.