Doctor's Notes on Pulled Hamstring
The hamstrings are the tendons that attach the large muscles of the back of the thigh to the bone. The hamstring muscles are the large muscles at the back of the thigh. Pulls of the hamstrings are strains of one or more of the hamstring muscles and are generally caused by overstretching or overcontracting fatigued muscles. Hamstring pulls therefore are most often the result of an overuse injury.
Symptoms and signs of a hamstring pull depend upon its severity. Associated symptoms can include mild to severe pain and swelling in the back of the thigh. Movement of the knee joint may be painful, and walking may be difficult. The actual injury may sometimes be felt as a pop or tear at the time it occurs.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.