Blood in stool and urine, the specific reasons are as follows: 1. Because of rectal bladder fistula, this often happens after bladder surgery or intestinal surgery, the surgery causes the bladder to connect with the rectum, which will cause bleeding when urinating or defecating, such as after bladder surgery or colon surgery. 2. Because the patient has urinary tract tumor and the tumor has metastasized and invaded the intestine, which will cause blood in stool and urine, For example, if bladder cancer invades rectum or colon, or kidney tumor invades colon, it will also cause bleeding in stool and urine, so it is better to go to hospital for CT examination of urinary system to rule out the existence of urinary tract tumor metastasis. 3. Hemorrhoids, hemorrhoids will also appear with blood in stool and urine, avoid sitting for a long time and avoid spicy and acidic food. .