High (proximal) hamstring tendinopathy is an injury to the tendons in the back of the thigh that connect hamstring muscles to the sit bone (ischial tuberosity) at the bottom of the pelvis. These tendons are prone to injury, particularly in activities that require repetitive motion, such as running or rowing, or those that require prolonged sitting. People who have high hamstring tendinopathy often complain of deep buttock pain, pain when sitting, or deep, posterior, upper thigh pain. The pain usually comes on gradually and may be aggravated by repetitive activities.