There are age differences in the number of urination under normal circumstances. Newborns urinate 4 to 5 times a day in the first few days of life, and then 20 to 25 times a day after 1 week; 15 to 16 times a day at 1 year of age; and 6 to 7 times a day at school age. If the number of urination per unit of time significantly exceeds the normal range of the above-mentioned age groups, it is called “frequent urination”. For example, school-age children should be considered to have frequent urination when they urinate ≥8 times during the day and ≥2 times during the night, with a volume of <200ml each time. Frequent urination can be divided into physiological and pathological. If the frequency of urination is transient due to excessive drinking, nervousness or sudden drop in temperature, it is physiological; if the frequency of urination is due to genitourinary system lesions, it is pathological. "Urinary urgency" refers to the inability to control urination or a sense of urgency to urinate, and when the urge to urinate comes, you have to urinate immediately and cannot wait a little; or after urination, you have the urge to urinate again and need to urinate urgently, and if you do not urinate in time, you will wet your underwear. "Painful urination" refers to the pain and discomfort in the urethra, lower abdomen and perineum when urinating. If urinary frequency is accompanied by urinary urgency, painful urination and incomplete urination, it is called "urinary tract irritation" or "bladder irritation", mainly due to inflammation or foreign body irritation of the urethra, bladder and prostate, but also due to neurogenic bladder or psycho-psychological factors. Pain and discomfort. If urinary frequency is accompanied by urinary urgency, painful urination and incomplete urination, it is called "urinary tract irritation" or "bladder irritation", mainly due to inflammation or foreign body irritation of the urethra, bladder and prostate, but also due to neurogenic bladder or psycho-psychological factors. Pain and discomfort. If urinary frequency is accompanied by urinary urgency, painful urination and incomplete urination, it is called "urinary tract irritation" or "bladder irritation", mainly due to inflammation or foreign body irritation of the urethra, bladder and prostate, but also due to neurogenic bladder or psycho-psychological factors. Pain and discomfort. If urinary frequency is accompanied by urinary urgency, painful urination and incomplete urination, it is called "urinary tract irritation" or "bladder irritation", mainly due to the urethra, bladder, prostate due to inflammation or foreign body irritation, but also due to neurogenic bladder or psycho-psychological factors, etc.