The frequent urination of pregnant women in late pregnancy is usually a normal physiological phenomenon, but it may also be caused by urinary tract infection during pregnancy, which requires patients to go to the hospital in time to determine the cause and then treat the cause. Common causes and treatments 1, normal physiological phenomenon: the fetal head pressure on the bladder causes frequent urination in pregnant women, mostly occurs 1-2 weeks before delivery, when the fetal head into the pelvis and the bladder is located near the pelvic cavity, easy direct pressure on the bladder, and then make pregnant women appear urinary frequency, urinary urgency symptoms. It is normal for pregnant women to have frequent urination in late pregnancy. If the frequency of urination is low and there is no vaginal bleeding, there is no need to worry about it and you can drink more water to prevent urinary tract infection. On the contrary, if the frequency of urination is serious or vaginal bleeding symptoms may be preterm labor, we should go to the hospital obstetrics department as soon as possible for fetal preservation treatment; 2, urinary tract infection: urinary tract infection is a variety of bacteria, viruses, mycoplasma, chlamydia in the urinary system due to reproduction of urinary tract inflammation, the main symptoms are urinary frequency, urinary urgency, urinary pain, fever, etc., may be caused by personal hygiene cleaning during pregnancy is not timely, you need to go to the hospital as soon as possible for routine urine examination The main symptoms are frequent urination, urgent urination, painful urination and fever. Pregnant women need their families to pay special attention to hygiene during late pregnancy due to mobility problems. They can wear loose, breathable clothes, wipe their bodies regularly and change their clothes frequently to prevent bacterial infections.