If there is a symptom of left posterior thigh tendon pain, the first thing you need to look at is whether there are factors of strenuous exercise or trauma. If there are these factors, we should consider the symptoms of muscle strain in the thigh, for this case, need to recuperate for a period of time, and then do some local heat, physical therapy, you can also choose non-steroidal anti-inflammatory drugs for pain treatment, such as oral diclofenac, after a period of recuperation will slowly ease. If the pain is not caused by traumatic factors, the possibility of lumbar disc herniation should be considered. Because a herniated lumbar disc can compress the sciatic nerve and radiate to the thigh, causing the symptoms of tendon pain, a CT examination of the lumbar area is needed to clarify. If the symptoms are caused by a herniated lumbar disc, physical therapy and traction for the lumbar area are needed, and medication, such as oral lumbar pain capsules or nerve-nourishing drugs, can also be considered. If the symptoms are severe, minimally invasive surgery should be considered.