The most common causes of medial pain at the root of the left thigh are as follows: First, after prolonged walking or strenuous exercise, muscle strain and inflammation of the fascia of the internal thigh muscle group occurs, which leads to pain. The main manifestation is localized tingling and pulling pain, which is aggravated when walking and can be reduced when resting in bed. The best way to deal with the pain is to take adequate rest, apply topical fotarine ointment, or take oral non-steroidal anti-inflammatory and analgesic drugs, such as Celebrex capsules. Secondly, trauma leads to strain of the inner thigh muscles, the pain level is usually more intense, and the hip joint activity at the root of the thigh is obviously restricted. Usually need to rest for 2-3 weeks before the symptoms can be gradually relieved, if necessary, you can also take oral medication. Third, hip joint lesions, such as femoral head necrosis or hip synovitis, resulting in muscle pain in the inner thigh, such pain is mainly soreness, swelling or stabbing pain, hip joint activities will be significantly limited, the pain can be increased when walking with weight.