Men wake up with back pain in the morning, it may be related to sleeping in one position for too long, or it may be related to lumbar muscle strain, lumbar back myofasciitis, ankylosing spondylitis and other diseases. If you sleep in one position for too long at night, it is easy to cause muscle spasms, especially in the lower back muscles, and you will have back pain when you get up in the morning. Lumbar muscle strain can present with the symptom of soreness of the low back muscles in the morning, which will be significantly relieved after appropriate activities. Lumbar back muscular fasciitis is caused by cold or exertion, which can cause pain and swelling in the lower back after waking up in the morning, and can be treated with physical therapy and oral painkillers. Ankylosing spondylitis can appear in the morning back pain, can be accompanied by morning stiffness, joint pain and other symptoms. In addition, the bed is too soft and having kidney disease may also lead to morning back pain. Therefore, if you have morning back pain, you should go to the hospital to get a clear diagnosis and deal with it accordingly.