The pain in the posterior thigh tendon after exercise may be caused by muscle ligament strain, lactic acid stagnation and so on. 1. Muscle ligament strain: It is possible that there is no warm-up before exercise, or the amount of exercise is too large, resulting in muscle ligament strain, leading to pain in the posterior thigh tendon after exercise. If the pain is caused by muscle strain, generally pay attention to rest, local heat will gradually improve. 2. Lactic acid buildup: too much exercise will lead to excessive muscle lactic acid, leg muscle lactic acid buildup will also cause leg pain, which leads to thigh pain after exercise medial tendon, can be relieved by rest, hot massage and other methods. There may be other reasons for the pain in the posterior medial thigh tendon after exercise, it is recommended to go to the hospital for examination in time.