Frequent urination refers to an increase in the frequency of urination. Normal people urinate about 8 times a day, about 0-/kloc-0 times at night. If the number of times during the day exceeds this range, or the interval between urination is less than two hours, it means that there is frequent urination. If you urinate more than once at night, it is called frequent micturition, which is also called increased nocturia. Therefore, it is necessary to carry out relevant examinations to clarify the causes of frequent micturition. Frequent micturition is often accompanied by symptoms such as urgency and dysuria, mostly caused by urinary tract infection. After infection, the urinary tract mucosa appears congestion and edema, accompanied by mucosal erosion, which will lead to increased local sensitivity of mucosa. When urine passes through the relevant mucosa or stimulates the relevant mucosa, it will produce the feeling of frequent urination. Frequent urination may also be caused by stones, tumors or foreign body stimulation. It is necessary to do B-ultrasound or CT examination of urinary system to further exclude related stimulating factors.