There are many reasons for frequent urination in men, which are mainly discussed based on how much the patient urinates each time, and may be due to cystitis, prostate enlargement and diabetes. 1. Small amount of urine each time: If the patient only increases the number of times of urination per day, but the amount of urine each time is very small, it may be due to the bladder or urethra due to infection or stones, such as cystitis, bladder stones, prostatitis, prostatic hyperplasia and urethral stones and so on. 2. Urine volume: If the patient not only urinates more often every day, but also has a large amount of urine each time, it may be due to physiological factors such as drinking too much water, or it may be due to nephritis, diabetes and other pathological factors. If men have unexplained frequent urination, they should go to the hospital for examination in time to make a clear diagnosis and receive treatment under the guidance of the doctor, so as not to be negligent, so as not to delay the condition.