If a pregnant woman suddenly has symptoms of severe pain in the left side of the waist, she should immediately go to the hospital for examination, which may involve gynecology, orthopedics, general surgery, and urology. For example, general surgery may present with acute abdominal problems, and accordingly come to a clear diagnosis and take treatment, and urology can be seen in cases such as kidney stones and ureteral stones, which can also produce severe pain. In gynecology, for example, early pregnancy may be ectopic pregnancy, and so on, which must be diagnosed and treated immediately. Orthopedics commonly includes injury, strain and cold, or previous lumbar disorders, such as slipped lumbar vertebrae, lumbar injury or herniated lumbar disc, which can cause symptoms to worsen and lead to severe pain. Therefore, if a pregnant woman suddenly develops severe pain on the left side of her back, it is an emergency and she must go to the hospital immediately for examination.