Enthesitis is an inflammation of the entheses, the location where a bone has an insertion to a tendon or a ligament. It is also called enthesopathy, or any pathologic condition involving the entheses. The entheses are any point of attachment of skeletal muscles to bone, where recurring stress or inflammatory autoimmune disease can cause inflammation or occasionally fibrosis and calcification. One of the primary entheses involved in inflammatory autoimmune disease is at the heel. It is associated with HLA B27 arthropathies like Ankylosing Spondylitis, Psoriatic Arthritis, Reactive Arthritis.Symptoms include multiple point tenderness like at heel,tibial tuberosity,iliac crest etc..