Getting up in the morning with sore back and legs may be caused by overwork, environmental factors, lumbar disc herniation and other factors. 1. Excessive exertion: During the day, some heavy physical labor or exercise for too long, resulting in the accumulation of lactic acid metabolites in the muscles, in the morning when you get up, the symptoms of lumbar soreness and leg soreness will occur. 2. Environmental factors: when sleeping at night, the indoor temperature is lowered, and no attention is paid to the waist and lower limbs to keep warm, resulting in the waist and lower limbs catching a cold, and in the morning when getting up, the symptoms will appear. 3. Lumbar disc herniation: the patient himself has lumbar disc herniation disease, when sleeping at night, sleeping posture is not correct, may lead to lumbar disc herniation aggravation, will appear in the morning lumbar soreness and leg soreness symptoms, may also be accompanied by lumbar pain, radiating pain in the lower limbs, lower limb numbness and other symptoms. When you wake up in the morning with sore back and legs and other obvious abnormalities, it is recommended that you go to the hospital for appropriate examination and treatment to prevent delays in your condition.