Sudden back pain can be caused by the following reasons: 1. It is induced by urinary stones, such as kidney stones or ureteral stones, which can induce patients to have sudden pain, or colic. 2. It is caused by herniated discs or trauma to the back, as well as tumor diseases and septic infections of the back, which trigger sudden pain in the back. When this happens, the patient should go to the hospital in time to see what kind of cause it is, and then consider giving appropriate treatment measures for treatment. If it is due to kidney stones, the patient should consider lithotripsy treatment. If it is due to lumbar disc herniation, conservative treatment or surgery can be given.