The common causes of red urine in men are as follows: 1. Infectious diseases, such as acute cystitis, pyelonephritis, bladder tuberculosis. 2. Stones in the urinary system, such as bladder stones, ureteral stones, after extracorporeal or lumpectomy lithotripsy treatment. 3. Traumatic diseases, such as penile trauma, kidney contusion, bladder injury. 4. Tumor diseases, such as renal cancer invading the renal pelvis, metastatic cell of the renal pelvis, ureter, bladder, prostate cancer. 5. 5, elderly prostate hypertrophy obviously protruding into the bladder can also appear red urine. 6, blood disorders, disorders of the coagulation mechanism, long-term application of a large number of anticoagulant drugs, can also lead to red urine. The above points are pathological states in which there is blood in the urine and the urine is red. In addition, eating certain foods or drugs can also make the urine red, such as rifampin, red heart dragon fruit, is not a pathological phenomenon, for the normal physiological metabolic phenomenon.