The causes of sudden back pain mainly include the following: First, it is considered to be caused by urinary stones or inflammation of the urinary system, due to stone blockage, which in turn leads to obstructive pain, mostly severe colic in the lower back, pain can be paroxysmal, when the stone goes down with the ureter, etc., through the narrow section then the pain will be relieved, if the stone is embedded in the narrow part again, it will cause another attack of pain. Low back pain due to urinary stones etc. can be relieved by taking antispasmodic and analgesic drugs with the pain. Second, consider caused by lumbar muscle strain, mostly due to lumbar disc herniation or lumbar muscle strain, etc., resulting in a sudden incorrect posture of the organism, which can cause a sudden increase in lumbar pain, and the pain can be relieved by rest or hot compresses, etc. The causes of low back pain are mainly the above two aspects, if the pain is severe, then you need to go to the hospital for systematic treatment in time.