Discharge of urine is light yellow, drink less water or long-term in a hot environment, sweat more when the color of urine is more concentrated, urine may become red, yellow, this is a physiological phenomenon, will not be accompanied by other obvious abnormalities, drink more water can improve the color of urine. Reddish, yellowish urine is considered to be caused by diseases, such as urinary tract infections, urinary tract stones, hematuria caused by urinary tract tumors. Usually accompanied by frequent urination, urinary urgency, urinary pain, as well as pain in both kidney areas and lower abdomen, considerations related to eating, such as eating dragon fruits, oranges, or darker-colored drugs caused by oral anti-tuberculosis drugs such as rifampicin capsules, the urine will be dark red.