Calcaneal spur : Calcaneal spur/heel spur occurs when a bony growth forms on the heel bone. Causes: heel spurs occurs when calcium deposits build up on the underside of the heel bone, also caused by strain on foot muscles and ligaments, stretching of the plantar fascia. Symptoms: intermittent or chronic pain while walking, jogging or running. If inflammation develops at the point of spur. Pain as pin sticking into the bottom of their feet