Once the back pain at night, the following causes are common: First, lumbar muscle strain: overwork during the day, if not timely activity rest, can lead to the clinical symptoms of lumbar pain by night, accompanied by lumbar stiffness. Massage, rest and hot compress treatment will make the clinical symptoms to be relieved quickly. Normally, we should strengthen the lumbar back muscle training to improve the strength and intensity of the lumbar spine muscles, which can improve the lumbar pain. Second, severe lumbar disc herniation, lumbar spinal stenosis, etc.: After standing or sitting during the day, neuroedema will be induced at night, thus producing clinical symptoms of lumbar pain. The lumbar spine lesion can be confirmed by CT scan or MRI examination. Early diagnosis and early treatment can lead to significant improvement of clinical symptoms, but if treatment is delayed, lumbar pain can be prolonged and recurrent.