Abdominal pain with blood in urine is considered to have cystitis or stones in the bladder, but there is also the possibility of bladder cancer as follows. 1. If there is a relatively heavy inflammation in the bladder, such as severe cystitis, this situation may occur. Inflammation will stimulate the bladder mucosa, making it congested and edematous, with increased sensitivity, followed by changes in the pressure inside the bladder, all of which will cause discomfort in the lower abdomen, which in turn will cause pain. Due to inflammation can also lead to increased permeability of blood vessels, thus causing blood leakage from the capillaries, manifested as hematuria, in which case routine urinalysis usually suggests positive urine leukocytes. Need timely anti-inflammatory symptomatic treatment, if the inflammation can be controlled, these bladder irritation symptoms will gradually disappear. 2. Bladder stones are manifested as lower abdominal pain, stones embedded in the bladder neck caused by bladder neck contracture, resulting in pain, and urination of the stones will cause the mucous membrane of the bladder neck, easily visible hematuria, it is recommended to go to the hospital for ultrasound or CT examination. 3. The clinical manifestation of bladder cancer is painless hematuria of the naked eye. Later, with the growth and development of the tumor, lower abdominal pain, hematuria, frequent urination and other symptoms similar to cystitis will appear. At the same time, there is inflammation after the surface of tumor breaks down and bleeds, it is recommended to do cystoscopy, and if it is found that there is space-occupying lesion in the bladder, it is necessary to carry out surgical treatment in time. Abdominal pain with blood in urine may have other causes, it is recommended to consult a doctor in time.