Waking up with sore legs in the morning can be caused by the following reasons: first, fasciitis of the legs, fasciitis of the legs is often due to cold, strain, and chronic sterile inflammation of the fascia of the legs, which can have morning soreness of the legs, and can improve after a while of activity, which should be early examination and examination to exclude other diseases to diagnose. Second, rheumatoid, rheumatoid can involve the bones and joints of the human limbs, can lead to joint or leg pain symptoms, can be accompanied by morning stiffness, then to early blood tests and examination of leg X-rays, CT to diagnose. Third, ankylosing spondylitis, ankylosing spondylitis can also involve the bones and joints of the limbs and legs, resulting in morning pain in the legs, which should be diagnosed and treated by blood tests, X-rays of the sacroiliac joints and X-rays of the lumbar spine. Fourth, kidney deficiency, kidney deficiency can also have the symptoms of soreness and weakness of the waist and knees, as well as soreness and weakness of the legs in the morning, which should be diagnosed by taking a pulse at the Chinese medicine department and treated with oral kidney medicine at an early stage.