Sudden lumbar pain in the elderly is common for the following reasons: First, lumbar fracture: such as lumbar vertebral compression fracture or lumbar transverse process fracture, can cause sudden severe lumbar pain, and accompanied by lumbar activity restriction, the patient usually has a clear history of trauma, taking positive and lateral X-ray of the lumbar spine will reveal the presence of fracture, after early reset and fixation, can make clinical symptoms can be relieved. Second, kidney stones, urinary system infection, etc.: can cause sudden lumbar pain, patients usually have a clear history of infection or stones, through routine urine examination and urinary system ultrasound examination can confirm the diagnosis, early diagnosis and early treatment can make the patient’s clinical symptoms can be rapidly reduced. Patients should also pay attention to the protection of the lumbar and urinary system in general to prevent the above diseases and prevent the sudden onset of lumbar pain symptoms.