Ureteral bladder wall segment stones, refers to the stones located in the lowermost part of the ureter, its etiology is complex, often associated with malnutrition, lower urinary tract obstruction, urinary tract infection, bladder foreign body and other factors. 1. Malnutrition: Primary bladder stones are mainly caused by long-term malnutrition and insufficient intake of animal protein. 2. Lower urinary tract obstruction: prostatic hyperplasia and urethral stricture can lead to poor urination. Metabolites can not flow out of the body with urine, and stones are deposited in the bladder. 3. Urinary tract infections: such as cystitis, etc., can contribute to the elevation of urine pH, resulting in the precipitation of magnesium salts, urinary calcium phosphate and ammonium, and the formation of stones. 4. Foreign bodies in the bladder: the presence of foreign bodies in the bladder can prompt the deposition of urinary salt crystals around the foreign body, and eventually form stones. 5. Other factors: such as intestinal bladder enlargement surgery, affected by intestinal mucus, bladder stones can also occur; in addition, bladder stones may also be associated with metabolic diseases and other factors. The appearance of urinary stones, the patient must be timely medical examination, and according to the cause of the disease, the condition, to take a reasonable way to intervene.