First, what is urinary frequency? Frequent urination means that the number of times you feel the urge to urinate increases significantly, while the amount of urine discharged each time decreases, or even just a few milliliters, often accompanied by a feeling of incomplete urination. It is a pathological condition. Under the condition of normal diet and water intake, the normal number of daytime urination is 5-6 times, the number of nocturnal urination is 0-2 times, and the volume of each urination is about 300-500 ml. If the volume of each urination is less than 200 ml, the number of daytime urination is more than 6 times, and the number of nocturnal urination is more than 2 times, which is known as urinary frequency. Second, the difference between frequent urination and excessive urination is that the number of times of urination increases, but the volume of each urination is normal. There are two kinds of urine physiological and pathologic urine. Frequent urination and urination are manifested as an increase in the number of urination, but the fundamental difference between the two is whether the amount of each urination is normal. Third, the causes of frequent urination 1, caused by bladder irritation: the common causes are as follows (1) urinary tract infection: acute vesicourethritis, genitourinary tuberculosis, adenoid cystitis, etc., usually accompanied by urinary urgency and urinary pain, burning sensation of the urethra and the feeling of incomplete urination. Symptoms can be relieved after treatment of urinary tract infection. (2) Urinary stones: bladder stones, lower ureteral stones, can also appear frequent urination. Usually there is a history of urolithiasis and a previous history of stone expulsion, which may be accompanied by urinary urgency, a feeling of incomplete urination, a sensation of falling, and blood in the urine. Relief is immediate after the stone is expelled. (3) Transurethral surgical operations, postoperative indwelling urinary catheters and ureteral stent tubes, etc., may be associated with intermittent sensation of holding in urine, blood in urine, and low back pain despite an empty bladder. Usually it can be improved by itself after removing the urinary catheter and ureteral stent tube. (2) Reduced bladder capacity (1) Reduced actual bladder capacity: usually referred to as small bladder or bladder contracture in medicine, due to bladder tuberculosis, bladder and pelvic tumors after radiotherapy resulting in reduced bladder capacity, in addition to the symptoms of the primary disease, there may be extreme urinary frequency, about 20-30 minutes to urinate once. Usually, the lesion is irreversible, and urinary diversion or indwelling catheter is feasible to relieve extreme urinary frequency symptoms and improve quality of life. (2) Reduced effective bladder capacity: the actual capacity of the bladder is normal, due to a variety of reasons for the bladder tension is too high, can not be fully dilated due to, such as: crural injury or lesions caused by neurogenic bladder, diabetes mellitus complicated by bladder neuropathy, etc., often have the history of the original pathology and symptoms, usually the original pathology is irreversible, can be symptomatic treatment. In addition, various reasons for not being able to empty the bladder each time and increased residual urine in the bladder after urination can also lead to a decrease in the effective capacity of the bladder and frequent urination. Common causes include prostate hyperplasia, urethral stenosis, etc. Treatment for the cause, such as transurethral resection of the prostate or urethral stenosis can be relieved after cure. 3.Primary overactive bladder refers to the frequency and urgency of urination, with or without urge incontinence, for which no cause can be found. There is no abnormality in the bladder structure, and it is caused by the functional changes of the bladder. At present, only symptomatic treatment, the effect is slightly worse. Fourth, the causes of excessive urination 1, physiological polyuria: including drinking a lot of water, after eating foods with diuretic effect, etc.. It is usually a transient polyuria, which can be relieved after adjusting dietary habits. 2, pathologic polyuria: uremia, acute renal failure polyuria, oral diuretic drugs, geriatric polyuria and so on. It is necessary to treat the primary disease. Correctly distinguish between frequent urination and polyuria, which is conducive to the differential diagnosis of the disease and the selection of targeted tests to improve the accuracy of the diagnosis and the effectiveness of treatment.