Normal vaginal discharge is white and transparent. Brown discharge on the panties in late pregnancy is an abnormal phenomenon, which can be considered to be caused by preterm labor, preterm labor and uterine diseases, and the causes should be clarified and treated accordingly. Common causes and treatment measures 1, preterm labor: typical symptoms are irregular contractions, fetal descent, redness, vaginal discharge, accompanied by a sense of weightlessness in the abdomen, abdominal cramps and back pain, and an increase in the number of urination and defecation after 37 weeks of pregnancy. If a pregnant woman has the above symptoms, she should promptly consult a doctor for delivery; 2, preterm labor: manifested as a small amount of vaginal bleeding before full term, oxidized by air in the panties can present brown discharge, pregnant women will also have intermittent or continuous lumbago, lower abdomen or pelvic cramps, while the abdomen has a sense of tightness with mild abdominal cramps, should promptly consult a doctor, hospitalization, given to inhibit contractions, such as nifedipine, magnesium sulfate, etc.; 3 The cause of leucorrhea should be clarified and vaginal drug treatment should be chosen as far as possible under the guidance of a doctor. Note 1, brown discharge in late pregnancy should be taken seriously, should go to the hospital in a timely manner to conduct relevant examinations to clarify the cause and then deal with the symptoms; 2, regular maternity checkups to keep track of the fetal condition and the physical condition of the pregnant mother.