Pain in the left lateral thigh is commonly caused by playing hip and left iliotibial bundle strain, as follows: first, playing hip: repeated friction between the broad fascia tensor muscle and the large trochanter of the femur can cause playing hip, and the patient will have painful symptoms in the left lateral thigh, which will affect the activities of the hip joint, and the painful symptoms increase when pressing and tapping, and the pain and ringing are more obvious when the patient walks; second, left iliotibial bundle strain: iliotibial bundle Located in the left lateral thigh, prolonged excessive weight-bearing and walking will lead to strain of the iliotibial bundle, and the patient will have painful symptoms in the left lateral thigh, and the painful symptoms are obvious when pressing. Patients with lateral thigh pain should be diagnosed and treated in time, and through massage and physical therapy, the symptoms can be controlled to the patient’s satisfaction.