The possible causes of red urine color in men are: First, acute urinary tract infections, such as acute urethritis and cystitis, which cause congestion, erosion and bleeding of the urethral mucosa, which can lead to red urine color, and this condition is usually accompanied by frequent urination, urinary urgency or increased urethral secretions. Secondly, stones in the urinary tract, such as kidney stones, ureteral stones or bladder stones, can cause red urine color. At the same time, it may be accompanied by pain in the area where the stone is located, such as back pain or abdominal pain. It is recommended to go to the hospital for an ultrasound examination of the urinary system to further confirm the diagnosis. Third, if the patient is of advanced age, it may be caused by prostate enlargement or tumor of the urinary tract, etc. Patients with prostate enlargement may have difficulty in urination, bifurcation of urination, etc. If the patient has a tumor of the urinary tract, the urine is only red in color and there may not be any other conscious symptoms. It is recommended to have an ultrasound, CT or cystoscopy of the urinary system to confirm the diagnosis.