Frequent urination refers to an increase in the frequency of urination, but a decrease in the volume of urine each time. Severe frequent urination usually means that we urinate in a short time and the volume of urine is small each time, and in severe cases it can reach once every half hour, which seriously affects our quality of life. There are two causes of severe urinary frequency. One is the frequency of urination caused by irritation, such as acute inflammatory infections, irritation caused by indwelling urinary catheters, and irritation below the ureter can seriously cause frequent urination. This kind of inflammatory urinary frequency can usually be relieved after removing the cause. The second type of inflammatory urinary frequency is due to an extreme reduction in bladder capacity, such as a bladder capacity of only 40ml or 50ml, which can lead to extreme urinary frequency. Common causes, such as tuberculosis of the urinary tract and tuberculosis of the bladder lead to contracture of the bladder.