Tea-brown urine may be caused by physiological factors, urinary tract infections, urinary stones, and urinary tract tumors. 1. Physiological factors: drinking too little water for a long time, resulting in urine concentration, the color of urine becomes darker, may become tea-colored urine, accompanied by a distinct odor, and presents a cloudy state, drink more water more urination, it will autonomously recover. 2. Urinary system infections: for example, acute pyelonephritis or acute cystitis, the infection is more serious, so that the local damage, causing bleeding, will lead to tea-colored urine, also accompanied by fever, fatigue, urinary frequency, urinary pain and other symptoms. 3. Urinary stones: for example, bladder stones, in urination or position change, the bladder mucosa is easily stimulated by the stone, causing bleeding, which will lead to the urine become tea-brown, accompanied by frequent urination, difficulty in urination, pain in urination and other symptoms. 4. Urinary system tumor: for example, bladder tumor, tumor surface tissue necrosis causes bleeding, which will lead to the urine is tea-brown, usually naked eye painless hematuria, may also be accompanied by lower abdominal pain, difficulty in urination and other symptoms. If the urine is dark brown and accompanied by other obvious abnormalities, it is recommended to go to the urology department of the hospital for appropriate examination and treatment to avoid delaying the condition.