Clinically, if a patient has left-sided low back pain, ask the patient how long the pain is, and combine the patient’s pain with the characteristics of the lumbar spine activity, whether it is accompanied by hematuria, whether it is accompanied by fever, the condition of the lower limbs, the symptoms of the abdomen and other factors for a comprehensive analysis. The duration of pain is more important. Generally, the most common acute pain clinically is urinary stones. If the patient has clear factors of injury to the lumbar spine, such as trauma, the most common cause is injury to the lumbar spine, including fracture or injury to the muscles of the lumbar spine. Then there are clinical spontaneous renal cyst rupture, tumor rupture or retroperitoneal problems, which may also cause patients to suddenly develop left-sided lumbar pain. Therefore, clinically, we must combine the patient’s symptoms and give the patient a complete magnetic resonance examination of the lumbar spine, including abdominal ultrasound, CT, urological ultrasound and other examinations to confirm the diagnosis, and only after the diagnosis is confirmed can we carry out the corresponding precise treatment according to the characteristics of the patient’s clinical disease.