Low back pain in the middle of the night is stronger but normal during the day, which is a more common phenomenon in daily life. The following reasons can be considered: First, it may be because the patient did not pay attention to keep warm during the night when sleeping, so that the waist is cooled, therefore, the pain will be felt at night. It is suggested that the patient should rest properly during the day, adjust the sleeping posture and pay attention to the warmth of the waist. Secondly, it may be a disease such as some kind of malignant tumor in the body, because the main symptom of tumor is pain in the waist at night, but it may be more normal during the day. Third, patients with lumbar disc herniation may also experience aggravation at night. If the patient often has lumbar pain in the middle of the night and more normal during the day, it is recommended to visit the hospital in time and further improve the relevant examination to treat the cause symptomatically.