Late pregnancy underwear is always damp, do not rule out amniotic fluid leakage, but may also be increased secretions or urinary incontinence caused by the specifics should also go to the local hospital in a timely manner to clarify the relevant examination. 1. Leakage of amniotic fluid: Leakage of amniotic fluid is actually premature rupture of the fetal membranes. When the fetal membranes of a pregnant woman rupture, she may feel that there is suddenly a large amount of fluid coming out of the vagina, and the amount of fluid flows sometimes more and sometimes less, and it will be obviously increased when the abdominal pressure increases. 2. Increased secretion: during pregnancy, women are affected by hormones, the vagina will be localized congestion, and induced a marked increase in secretion, which is a normal physiological phenomenon. 3. Urinary incontinence: late pregnancy due to the uterus is too large, pressure to the bladder, it is easy to produce urinary incontinence. The main manifestation of urinary incontinence is involuntary leakage of urine, but after the woman has given birth, this symptom will gradually disappear. Late pregnancy is a special period of time, if a woman has physical abnormalities, it should be highly attention, go to the local hospital in a timely manner, as soon as possible to find the problem as soon as possible treatment.