If a male patient has a red urine color, then the possible causes are: 1. Staining is triggered by consuming food containing pigment or related drugs. If you check the urine routine and there are no red blood cells in the urine, then consider it to be caused by staining. Common drugs such as rifampin capsules and phenolphthalein tablets can cause red urine color. 2, tumors of the urinary system, when urological tumors occur, tumors appear destruction, necrosis, bleeding mixed in the urine, visible red urine color, generally no obvious pain, but when the tumor volume is large or cause surrounding metastasis, painful symptoms can appear. It is recommended to perform further CT or ultrasound examination of urinary system to exclude the presence of tumor. 3. Stones in urinary system may show red urine color and local breakage and bleeding of mucosa due to stimulation of mucosa by stones, and hematuria may be seen in the mixed urine. Patients with stones also have significant pain in the lower back and abdomen, which is relatively intense and often unbearable. If the pain in the lumbar abdomen is accompanied by red urine, the stone is considered and an ultrasound examination of the urinary system is recommended to exclude it.