The brown discharge on the 30th day of pregnancy is mainly caused by pre-eclampsia, ectopic pregnancy, gynecological or other diseases, which can be checked at regular hospitals to clarify the cause and then treat the cause. 1. Pre-eclampsia: the bleeding is less at first, often dark red or brown discharge, occasionally accompanied by lower abdominal pain, which is considered to be caused by pre-eclampsia, which requires the pregnant woman to go to the hospital as soon as possible for relevant obstetric examinations and, if necessary, for fetal preservation. Treatment. At the same time, pay attention to bed rest and regular obstetric checkups at the later stage. 2. Ectopic pregnancy: vaginal bleeding after menopause, the amount of blood may be more or less, accompanied by gradually increasing lower abdominal pain, is considered to be ectopic pregnancy and requires immediate hospital consultation. If the ultrasound examination indicates that no pregnancy sac is seen in the uterine cavity, the diagnosis of ectopic pregnancy is confirmed and requires surgical treatment or conservative treatment under the operation of professional doctors; 3. gynecological diseases: pregnant women with combined gynecological diseases, such as cervicitis and cervical erosion, may also have brown discharge, which can be treated under the guidance of doctors after feasible gynecological examination, mostly with vaginal medication to reduce the impact on the fetus; 4. gravida and choriocarcinoma. The main manifestation is irregular vaginal bleeding, the amount is small at the beginning, which is easily misdiagnosed as pre-eclampsia miscarriage, after which the bleeding gradually increases and often intermittently bleeds a lot, sometimes it can naturally discharge blister-like tissue, at this time, you should go to hospital in time, and after clear diagnosis, it should be removed immediately. The 30 days of pregnancy belongs to the early stage of pregnancy, pregnant women should pay attention to a light diet, balanced nutrition, prohibit sexual intercourse, so as not to affect the fetal implantation and development, maintain emotional stability, more rest, and avoid strain.