The discharge of blood in late pregnancy may be due to redness, placenta praevia, gynecological diseases and other reasons. 1. Redness: blood in the secretions in the second trimester of pregnancy may be redness, which is a precursor symptom of labor, the fetal membranes and the wall of the uterus at the place where the peeling off of the small capillary rupture, there may be a small amount of bleeding, and the secretions are mixed with the secretions, manifesting blood in the secretions. 2. Placenta praevia: In late pregnancy with placenta praevia, as the placenta is attached to the lower part of the uterus, it will cause some irritation to the cervix, which may lead to blood in the secretion. 3. Gynecological diseases: Gynecological diseases in late pregnancy, such as cervical inflammation, inflammation stimulates the mucous membrane of the cervix to become congested and edematous, which may lead to a small amount of bleeding, mixed with the secretion, which is manifested as blood in the secretion. There are many reasons for the blood in the secretions in late pregnancy, and it is necessary to go to the hospital to see the examination in order to judge, and it is recommended to seek medical treatment as soon as possible.