Legs can be sore every morning due to the following causes: 1, leg fasciitis, when the legs due to cold or strain and lead to chronic aseptic inflammation of the muscle membrane of the legs, can have the symptoms of sore legs after waking up every morning, then early examination and examination to exclude other diseases to diagnose; 2, rheumatoid, when there is rheumatoid, can lead to bilateral legs in the morning after the symptoms of soreness, often accompanied by This is the time to check the X-rays of the legs, CT and blood tests to diagnose and treat early; 3, ankylosing spondylitis, ankylosing spondylitis in serious cases can also involve the joints of the whole body as well as the muscles and fascia of the legs, resulting in the symptoms of sore legs after waking up in the morning, then we should check the blood tests and take X-rays of the sacroiliac joints and lumbar spine to diagnose and treat.