Left leg straighten the back of the leg fossa a tendon gripping the pain of the causes of excessive exercise, calcium deficiency, lumbar spine disease, etc., for different reasons should be taken to rest, medication, surgical treatment and other methods. 1. Excessive exercise: If excessive exercise leads to pain in the left leg straightening a tendon in the leg fossa, you should pay attention to rest, avoid strenuous exercise, avoid cold, under the guidance of a doctor orally non-steroidal anti-inflammatory analgesic drugs, such as celecoxib, ibuprofen, etc., but also can be externally coated with diclofenac diethylamine latex cream and other ointment. 2. Calcium deficiency: Calcium deficiency can also lead to left leg straightening after a hamstring pulling pain, at this time should pay attention to consume calcium-rich foods, such as milk, soy products, etc., but also according to the situation of the appropriate amount of calcium supplements. 3. Lumbar spine diseases: such as lumbar disc herniation and other diseases, compression of the nerves in the leg will lead to the left leg straightening leg fossa a tendon gripping pain, according to the degree of the disease should be taken to rest, conservative treatment or surgical treatment. The left leg straighten the back of the leg fossa a tendon pulling pain may also be caused by other reasons, once the pain can not be relieved or intense pain, should go to the regular hospital in a timely manner, to identify the cause and targeted treatment.