What is a heel spur and why does it occur? Heel spur is a bony protrusion that occurs on the sole of the foot, near the heel bone, and is usually caused by irritation of the plantar fascia. Factors such as prolonged standing, incorrect shoe use, overweight and age factors can lead to irritation of the plantar fascia tissue and cause the development of heel spurs. Biomechanical problems in the foot structure [...]