The most common reason for men to go to the toilet in the middle of the night may be: a. The most common cause of prostatic hyperplasia in men is the increase in the size of the prostate gland with age, which can cause an increase in resistance in the urethra, and the prostate gland protrudes into the bladder area to stimulate the bladder triangle, which can easily produce frequent urination at night, all accompanied by symptoms such as poor urination, bifurcation of urination or effort to urinate. It is recommended that men over 45 years of age undergo an ultrasound examination of the prostate to find out if there is prostate hyperplasia. Second, if a woman is mostly seen with pelvic floor organ prolapse, there may be an increase in residual urine in the bladder due to bladder prolapse. After lying down at night, there will be repeated urination and frequent nocturnal urination, which may be accompanied by symptoms such as poor urination or an obvious feeling of incomplete urination and frequent urination, and it is necessary to conduct an examination related to the pelvic floor muscle to confirm the diagnosis. Third, the presence of stones, tumors or acute and chronic infections in the urinary tract can lead to frequent urination at night. Further ultrasound and CT of the urinary system are needed to clarify whether there are related diseases.