The causes of lateral hamstring pain in patients, including thigh muscle strain or acute sprain, lower limb vascular diseases, etc., are as follows: 1, thigh muscle strain or acute sprain: frequent strenuous sports, or because of trauma, falls, are likely to cause sprain of the muscles of the outer thigh, will appear soreness and pain in the outer thigh, can be manifested as the soreness of the lateral femoral muscle region, can also be manifested as the broad fascia 2, lower limb vascular disease: if there is a deep vein thrombosis in the lower limb, when the blood flow is blocked, it will cause linear pain in the lower limb, usually starting from the calf and gradually progressing to the root of the thigh, accompanied by obvious swelling of the limb.