According to the description of the situation, the causes of back spasms are the following: First, excessive fatigue, after a lot of exercise or a long time without rest, the muscles will produce a lot of lactic acid, and constantly accumulate, stimulating the muscle body to spasm. Second, cold stimulation, such as swimming without warm-up exercises, stimulated by cold water, sleep at night without a good quilt or in cold weather, wear clothes not warm enough. Third, calcium deficiency, too little calcium intake, can also cause back spasms, this is not necessarily too little calcium absorption, may also be due to the spleen and stomach on the poor absorption of calcium caused by, it is recommended to regulate the spleen and stomach.