Lower back pain that is mild during the day and light at night may be due to mild lumbar muscle strain, cold in the lower back, and mild lumbar spine degeneration. If you suffer from mild lumbar muscle strain, due to prolonged sitting and standing at work during the day, or other activities that put heavy pressure on the lumbar region, so that the lumbar muscles are strained, in the initial stage, the pain may only occur when you are more tired, and at night when you rest the lumbar muscles are relaxed, so that the pain is relieved. If there is a cold in the lumbar region, it is usually due to the fact that the cold air is usually turned on or no attention is paid to keep the lumbar region warm during seasonal changes, which leads to cold in the lumbar region and produces aseptic inflammation and leads to lumbar pain, but the symptoms will be alleviated or even disappear because of the fact that the lumbar region is removed from such an environment in the evening. If you suffer from mild lumbar degeneration, usually due to work or other reasons for prolonged sitting and standing, caused by the lumbar disc herniation, due to the symptoms have not worsened at this time, may only be in the daytime at work or study episodes and feel the pain, to the bed at night to get some rest, the pain will be relieved or even disappeared. There may be other reasons for this symptom. If the symptom is difficult to be relieved, you should consult a doctor in time to get a clear diagnosis and follow the doctor’s instructions for treatment.