The most common cause is lumbar disc herniation, where the herniated disc compresses or stimulates the nerves, resulting in tugging-like pain or radiating pain in the muscles of the innervated area, which is what we call cramping. The best way to deal with this condition is to improve the CT or MRI examination of the lumbar spine to clarify the extent and location of the herniated lumbar disc. If the degree of protrusion is relatively light, you can usually choose medication, if the degree of protrusion is heavy, surgery may also be required. Second, because of the lack of calcium in the body, because of hypocalcemia and thus lead to small cramps, for this case should actively improve the blood test, if there is indeed low blood, generally speaking, after replenishing calcium, cramps can be significantly improved.