There are two reasons for back pain when staying up late, 1, is that when staying up late there must be sedentary, standing, or even bending over to do heavy work. At this time the lumbar muscles are still in a state of tension, and the memory of the human body at night the lumbar muscles should be relaxed, so it is easy to cause soreness nature of the strain, strain injury. 2, compared to the low temperature of the day and night, in the case of the above-mentioned surgical strain, strain injury, there is the problem of wind, cold, the symptoms of lumbar soreness will be more obvious. In this case, as long as you can rest in bed as much as possible, lift the problem of staying up late, pay attention to the warmth of the lumbar spine area, and do more hot compresses on the lumbar spine area, the symptoms will gradually reduce and there will be no major problems. If there is no improvement, and still stay up late for a long time, it is possible that on top of this, the muscles around the lumbar spine will weaken the protection of the lumbar spine itself, which will easily produce a lumbar disc protrusion.