Sudden sharp pain in the waist may have the following reasons: first, urinary stones, when the kidney stones walk down through the ureter stuck in the ureteral stenosis, there can be a sharp pain in the waist, often colicky, can be paroxysmal aggravation, but also can be reflected to the abdominal pain, can be accompanied by hematuria, this time to carry out the ultrasound of the urinary system or imaging for early diagnosis and treatment; second, rupture of the tumor of the kidney, when the tumor rupture, there can be sudden sharp pain in the waist, often tearing pain; third, CT, nuclear magnetic examination of the kidney for early diagnosis and treatment. Tumor rupture, when the kidney tumor rupture, there can be a sudden sharp pain in the waist, often tear-like pain, then we should carry out CT and nuclear magnetic examination of the kidney for early diagnosis and treatment; Third, renal vascular disease, when the arteries of the kidneys are blocked, such as due to infarction or embolism, then there can be a sharp pain in the waist, or tear-like pain, then we should carry out appropriate angiography for early diagnosis and treatment; Third, renal vascular disease, when the arteries of the kidneys are blocked, such as due to infarction or embolism, then there can be sharp pain in the waist, and also tear-like pain. Appropriate angiography should be performed for early diagnosis and treatment.