It is not true that the color of urine represents different diseases; the color of urine can be affected by a variety of factors, not always related to pathological factors. If the urine is yellowish, it may be related to the concentration of urine caused by insufficient water intake, which is a normal physiological phenomenon; at the same time, it may also be related to diseases such as urethritis and cystitis, in which the patient’s urethra will show some inflammatory secretions, leading to yellowish urine. If the urine is reddish, it may be related to the consumption of red dragon fruit and other foods that contain a lot of red anthocyanins, which is a normal physiological phenomenon; long-term occurrence of this phenomenon, should also be alert to the possibility of urethral ulcer bleeding and stone disease and other diseases. Abnormal urine color does not necessarily mean that there is a disease, can not be used to determine the cause and diagnosis; if this phenomenon occurs over a long period of time, it is recommended to consult a doctor in a timely manner.