If a patient has pain in the medial tendon of the left thigh, the triggering causes are left thigh inguinal ligament strain, lymphadenitis, left hip degenerative osteoarthritis and synovitis, etc., as follows: i. A left thigh inguinal ligament strain will easily lead to pain in the medial tendon of the left thigh. Second, left thigh inguinal lymphadenitis, also prone to painful symptoms in the left medial thigh tendon. Third, degenerative osteoarthritis of the left hip joint and synovitis of the left hip joint can also lead to pain in the medial tendon of the left thigh. Fourth, patients with left femoral head necrosis are also prone to radiating pain in the left medial thigh tendon. Therefore, after the patient has pain in the left medial thigh tendon, he must consult a doctor, identify the cause of the disease, and treat the cause of the disease to promote the pain symptoms to reduce the recovery, and when the pain is obvious, he should rest in bed more often, avoiding forceful activities of the leg to avoid aggravating the pain, and can apply non-steroidal anti-inflammatory drugs, together with blood circulation drugs to temporarily relieve the symptoms.