Many diseases can cause frequent urination. Overactive bladder disorder is a disease that typically causes frequent urination, but the cause of frequent urination in this disease is related to urgency, i.e., a sudden feeling of urgent urination that is difficult to be delayed and often presents with urge incontinence. Many urinary frequency is related to increased urine volume, such as polyuria due to diabetes mellitus, etc. Some urinary frequency is also related to reduced bladder capacity, or increased residual urine or bladder fibrosis (such as contracture of the bladder due to tuberculosis, etc.), and many urinary frequency is related to interstitial cystitis, that is, special discomfort in the bladder area when holding urine, pain in the lower abdomen when holding more urine, which can be relieved somewhat after urination, and this discomfort of holding urine generally increases gradually with the increase in urine volume This discomfort of holding urine generally increases gradually with the increase in urine volume, but generally not incontinence. In addition, bladder leukoplakia, adenoidal cystitis, chronic cystitis, urethral hymen fusion, urethral caruncle, etc. Therefore, a careful identification of the cause of frequent urination is required by a urologist. In addition to routine physical examination, urethral orifice examination, we can also perform urinary flow rate plus residual urine volume measurement to understand urinary function, intravenous pyelogram to understand the presence of urinary tuberculosis and stones, urine culture to understand the presence of drug-resistant bacterial infections, urine cytology to understand the presence of extensive in situ carcinoma of the bladder, urine to find tuberculosis to understand the presence of urinary tuberculosis, when all of the above tests are normal, we also have to do water expansion under anesthesia plus random biopsy to determine if it is interstitial cystitis, some do cystoscopy to see if there are lesions such as bladder leukoplakia, adenoidal cystitis, bladder neck polyps, etc.