Waking up in the morning with back pain during the day may be due to overworked muscle strain, incorrect sleeping posture or osteoporosis-related symptoms. 1. Muscle strain: lumbar muscle strain occurs when you overwork during the day because the lumbar muscles become tense and stiff after excessive exertion, and then tiny injuries occur. When resting, these minor injuries are more obvious. After getting up and moving around, the blood circulation of the whole body is accelerated, the local muscles get more blood supply, and the distraction after getting up will also produce the feeling of pain relief. 2. Incorrect sleeping posture: sleeping sideways or lying on your back for a long time at night, the local muscles will be compressed for a long time, which will cause lumbar muscle injury and poor local blood circulation, inducing lumbar pain, which will be relieved after getting up and moving around. 3. Osteoporosis: Osteoporosis because of the night rest when blood circulation slows down, the blood supply to the waist bone is reduced, wake up in the morning there will be back pain, and during the day because of the increase in blood circulation, the pain is reduced. It is recommended that a bone density test be performed to confirm the diagnosis. If osteoporosis is diagnosed, anti-osteoporosis treatment should be given actively, and at the same time, drink more milk, take calcium tablets orally and do outdoor activities appropriately. If you have back pain, you should go to the hospital in time, ask the doctor to clarify the cause of the disease, and if necessary, carry out the appropriate treatment.