In the clinic, we often see some patients come to say that they have urinated frequently, but each time the volume of urine is normal, and they cannot distinguish between frequent urination and increased urine volume. Normal people urinate from 1000ml to 2000ml in 24 hours, less than 100ml is no urine, less than 400ml is little urine. If the number of urination increases and the volume of urine does not decrease or even increases, excluding pathological factors such as diabetes, it may be caused by physiological factors, such as increased water consumption, consumption of diuretic food, and reduced sweating in cold weather in winter may also cause an increase in urine volume. What we normally mean by frequent urination is a significant increase in the number of times we feel the urge to urinate, and in severe cases, we urinate once every few minutes, but the volume of urine each time is significantly reduced, even to a few milliliters. The frequency of urination is mainly caused by urinary tract infections, prostatitis, etc. Sometimes mental factors can also cause frequent urination. The frequency of nighttime urination in elderly men is commonly associated with prostate enlargement.