Muscle pain in the lumbar region is often caused by the following mechanisms: 1. It may be caused by muscle spasm in the lumbar region, which is often seen in patients who are relatively fat or who often do heavy physical work. The lumbar muscles of such patients need to bear a relatively large load for a long time, it is possible that in the process of activity because of muscle fatigue and lack of strength, followed by muscle spasm. This is because of the pain in the lumbar muscles, and when you touch it, you can feel the muscle strips that are obviously spasming. 2, may be due to inflammation within the lumbar muscles, often seen in patients with cold in the lumbar region, such as young women often have insufficient clothing here, which leads to cold, wind, which can lead to aseptic inflammation of the lumbar muscles, such as the erector spinae, and thus This causes pain in the lumbar muscles. In addition, this inflammation may also be caused by external diseases, such as influenza or epidemic hemorrhagic fever, which may also complicate the inflammation and cause pain in this area. 3, the pain in this area may also be caused by the deposition of lactic acid inside the muscle, such as patients do high-intensity exercise, at this time, the muscle does a lot of anaerobic respiration, and then produce The deposition of lactic acid may cause severe pain in the muscle.