The appearance of outer thigh muscle tension may be due to physiological tension caused by excessive exercise, or it may be caused by muscle strain, hip joint lesion, gluteal muscle contracture and other pathological reasons. 1. Excessive exercise: may be the lower limbs excessive exercise, exercise caused by the accumulation of lactic acid within the muscle, muscle tension contraction, caused by the lateral thigh muscle tension, general rest, stretching can be relieved. 2. Muscle strain: local muscle injury, such as strenuous exercise, etc., occurring to varying degrees of muscle fiber rupture, causing swelling and inflammatory edema, resulting in tightness and stiffness of the lateral thigh muscles. 3. Hip joint lesions: such as osteoarthritis of the hip joint, necrosis of the femoral head, etc., can lead to spasm and stiffness of the muscles around the hip joint. 4. Contracture of gluteal muscle: if trauma, hip injection and other reasons lead to contracture of the gluteal muscle, it can pull the broad fascia tensor muscle connected with it to become tense, and the outer thigh muscles will become tense. There are other causes of lateral thigh muscle tension, such as trauma, etc., if rest does not relieve, it is recommended to go to the hospital in a timely manner to improve the relevant examinations, to clarify the cause of the disease, and then follow the doctor’s instructions for targeted treatment, so as not to delay the condition.