Pain in the heel can be caused by plantar fasciitis. The plantar fascia is the tendon-like structure extending from the heel (calcaneus) to the toe joints on the plantar side of the foot. In some cases, calcification of the plantar fascia at its insertion point to the calcaneus occurs and is observable on an X-ray. Treatment consists mainly of conservative measures (insoles, physiotherapy) and rarely requires surgery. If surgery becomes necessary, endoscopic minimally invasive surgery is possible with promising results.