Possible causes of abdominal pain plus red urine color: 1. Acute cystitis, when the inflammatory infection, the whole bladder diffusely changes appear congested edema. At this time, patients appear frequent urination, urinary urgency with small abdominal distension or downward pain, and fleshly hematuria is visible during urination. It is recommended that routine urine examination be performed and oral or intravenous antibiotic treatment be administered after diagnosis. You can choose to take one capsule of levofloxacin orally 3 times/day. You can also choose levofloxacin injection 0.2g IV, 1 time/day, for one week, and observe the improvement of symptoms. 2. Stones in the urinary system, such as ureteral stones or bladder stones, may present with abdominal pain plus red color of urine. Further ultrasound examination of the urinary system is recommended, and extracorporeal shock wave lithotripsy or medication for stone removal if stones are present. The abdominal pain and red color of urine may disappear gradually after the stones are removed.