The common causes of frequent urination are prostate hyperplasia, prostatitis, urinary tract infection, diabetes and mental factors. It should be noted that normal people urinate 4-6 times during the day and 0-2 times at night. 1. Frequent urination and reduced urine output: (1) Prostatic hyperplasia: the most common first symptom is frequent urination, which is worse at night. This is because the enlarged prostate can irritate the urethra, while the enlarged gland gradually protrudes into the bladder and urethra, exerting pressure on the bladder triangle and producing frequent and urgent urination. In the late stage, prostate hyperplasia is obvious, producing obstruction leading to difficulty in urination, increased residual urine in the bladder, and gradually worsening urinary frequency. (2) Prostatitis: due to the inflammation of the prostate gland stimulation can involve the neighboring parts of the bladder neck, inflammation directly stimulate the bladder neck to produce frequent urination. (3) urinary tract infection: especially in acute cystitis, bladder inflammation makes the urinary center in the state of excitement, recurring urge to urinate, will also lead to more frequent urination. 2. More frequent urination but no decrease in urine output: (1) Diabetes mellitus: increased sugar in the urine produced by the kidneys leads to an increase in osmotic pressure, and the urine reductions. (2) Psychiatric factors: there can be psychogenic overdrinking leading to increased urination. (3) Ureaplasia: excessive urination may be caused by central lesions. Frequent urination may also be caused by other factors, it is recommended that patients go to the regular hospital hospital consultation and treatment in a timely manner to avoid the deterioration of the condition.