Late pregnancy always want to urinate at night, belongs to the increase in nocturia, may be a normal physiological phenomenon, or abnormal urinary tract infection. 1. Physiological phenomenon: pregnancy uterus with the growth of the fetus in the gradual increase in the late pregnancy of women, the uterus has increased to the bladder position above, and the head of the fetus gradually downward, can be on the bladder to cause a certain amount of pressure, resulting in late pregnancy women in the night urination frequently, urination increased. 2. Urinary tract infection: In addition to the increased urge to urinate and urination, accompanied by abnormalities such as pain in the urethra during urination, we need to be alert to urinary tract infections, such as urethritis, cystitis and other possibilities. This kind of situation is mostly caused by pregnant women do not pay attention to their own hygiene, pregnancy immunity decline and other circumstances. It is recommended that women in late pregnancy who experience increased nocturia should seek medical attention as soon as possible.