There are many causes of neck, shoulder, lumbar and leg pain, which are also common clinical diseases. The causes of neck, shoulder, lumbar and leg pain include the following: 1. neck pain: mainly related to cervical spondylosis; 2. shoulder pain: mainly related to frozen shoulder, tendon inflammation and other diseases; 3. lumbar pain: mainly related to lumbar muscle strain, lumbar disc herniation, lumbar spine osteophytes, disorders of small joints in the lumbar region; 4. leg pain: mainly related to osteoarthritis of the knee joint.