Bleeding brown in early pregnancy may be caused by embryo implantation, or it may be caused by preeclampsia, cervical polyps and ectopic pregnancy. 1. Embryo implantation: patients with early pregnancy brown bleeding phenomenon, may be early pregnancy embryo implantation in the uterine cavity caused by the patient may flow a small amount of dark red blood, is a normal physiological phenomenon, this time due to bed rest. 2. Pre-eclampsia: In early pregnancy, patients may experience symptoms of pre-eclampsia such as small amounts of vaginal bleeding, lower abdominal pain or lumbar distress. 3. Cervical polyps: the cause of cervical polyps is not clear, most of them are caused by chronic inflammation, cervical infection and other factors. The main symptoms of patients are abnormal vaginal bleeding, leukorrhea, so pregnant women combined with cervical polyps will also have early pregnancy bleeding performance. 4.Other:Pregnant women with ectopic pregnancy, hyperemesis gravidarum and other diseases can also lead to the phenomenon of early pregnancy bleeding brown. Patients with symptoms of brown bleeding in early pregnancy should consult a doctor in time to clarify the cause of the disease and carry out the treatment for the cause.