The causes of thigh pain above the knee are many, often considered to be local injury, bone tumor, local inflammation, viral infection, as follows: First, local injury: the role of external forces leading to the patient’s femur fracture, local soft tissue contusion, can lead to the presence of obvious pain in the thigh above the knee, and the swelling is very strong, the presence of a large number of subcutaneous ecchymosis, pressing the local may be present in the obvious bone friction sounds or There may be obvious bone friction sound or bone friction sensation, or even deformity. Bone tumor: if the patient has a bone tumor of the femur, it will also lead to obvious pain symptoms in the thigh and hip above the knee. Local inflammation: if the patient has inflammation of the femur itself, muscle strain, pear-shaped muscle syndrome, lateral femoral dermatitis, it will also lead to obvious pain symptoms in the thigh above the knee. Fourth, viral infections: patients with localized herpes zoster can also lead to pain symptoms in the thigh.