Every morning when waking up the legs will be very tired, the following common causes: 1, lower limb venous lesions: such as varicose veins or venous thrombosis, the patient will occur lower limb venous blood circulation return obstruction, therefore, the leg muscles and other tissue metabolic level will decline, lactic acid can easily accumulate in the muscle, so that the daily morning when waking up the legs have clinical symptoms of soreness, and will be accompanied by fatigue. Through vascular ultrasound examination, the specific lesions of blood vessels can be found, and early treatment can relieve the clinical symptoms, and serious cases need to consider surgery. 2, muscle strain: daily heavy physical labor or excessive exercise can also lead to serious strain on the leg muscles the next morning, and there will be obvious fatigue in the legs, and there can be weakness symptoms.