A small amount of fluid in the uterine cavity will not affect menstruation and the woman will not experience any discomfort in the lower abdomen. A small amount of fluid in the uterus can be treated by pelvic physiotherapy and oral anti-inflammatory drugs. If the effect does not improve after anti-inflammatory and pelvic treatment, the fluid can be drained out of the uterus through the cervix if necessary, and anti-inflammatory drugs can be injected into the uterus for treatment. Women should pay attention to keep the vulva clean and hygienic to avoid the upstream infection of the cervix and the spread of pelvic inflammatory disease.