Reddish-brown urine may be caused by physiological factors, or by pathological factors such as urinary system infection, glomerulonephritis, and bladder calculi. Patients should go to the hospital for a check-up and diagnosis of the cause in a timely manner, and receive treatment according to the symptoms.

I. Physiological factors

This is usually caused by the consumption of foods with deep colors such as pitaya, carrots, and beetroot, which contain a high amount of anthocyanins. The anthocyanins mix with the blood, enter the urine after metabolism and circulation, resulting in reddish-brown urine. This is a normal phenomenon and generally does not require special treatment. It can be relieved after stopping the intake, and patients should pay attention to moderate consumption in their daily life.

II. Pathological factors

1. Urinary system infection: Bacterial infection stimulates the urethral mucosa, causing congestion and damage to the mucosa, with blood entering the urine and changing the urine color. Medications such as Levofloxacin Tablets, Cefcloxacillin Sustained-Release Tablets, and Renlin Qing Granules can be taken under the guidance of a doctor.

2. Glomerulonephritis: Inflammation affects the kidney’s filtration function, causing red blood cells to leak out and mix with the blood, making the blood reddish-brown. Patients can take medications such as Isosorbide Dinitrate Tablets, Lisinopril Capsules, and Penicillin Tablets under the guidance of a doctor.

3. Bladder calculi: During the movement of stones in the patient’s body, the urethral mucosa is rubbed and torn, causing bleeding. The blood enters the urine, resulting in a reddish-brown urine color. Patients can take medications such as Nalidixic Acid Tablets, Norfloxacin Capsules, and Shenshitong Granules under the guidance of a doctor.