The possible causes of urinary bleeding in men are as follows: 1. Tumors in the urinary tract, seen in elderly patients or patients with long-term exposure to paints or benzene chemicals, often manifest as red urine, but not accompanied by obvious pain, further CT examination of the urinary system is needed to rule out the presence of tumors. 2. 3, urinary stones can also cause bleeding in urination, the stones cause damage to the surrounding mucosa and lead to local bleeding, blood is mixed in the urine, which is manifested as red urine, the urinary system ultrasound examination is needed to further confirm the diagnosis, urinary stones are usually accompanied by obvious pain, such as lumbago, abdominal pain, Abdominal pain.4. If there is systemic coagulation dysfunction or reduced platelets, etc., it can cause bleeding in urination. In addition, it may also be accompanied by bleeding from gums, skin mucosa and other parts of the body, so coagulation function and platelet tests are needed to confirm the diagnosis.