The most common causes of left medial thigh tendon pain are chronic strain, acute injury, hip joint lesions, sciatica, etc. If the symptoms persist, it is recommended to seek timely medical treatment. 1. Chronic strain: If you are engaged in heavy physical labor for a long time, it is easy to cause chronic strain of the inner thigh muscles, and when the muscles of the leg are stimulated by cold, the pain of the inner thigh tendon may occur. 2. Acute injury: If you are engaged in strenuous exercise, it is easy to cause the strain of the inner thigh muscles, or the inner thigh is hit by the outside, which may cause the pain of the inner thigh tendon. 3. Hip joint lesions: Hip joint lesions can also cause pain in the medial thigh tendon, such as femoral head necrosis, hip joint inflammation. 4. Sciatica: various factors induce sciatic nerve irritation symptoms, such as lumbar disc herniation or pyriformis syndrome, the pain mainly involves the buttocks and the back of the thighs, but also can be involved in the inner thigh, causing tendon pain. There are many causes of left inner thigh tendon pain, if the symptoms continue to be unrelieved, it is recommended to go to the hospital in time to identify the cause of the disease, targeted treatment.