Bleeding from poop at 18 weeks of pregnancy is most commonly caused by hemorrhoids. Usually this bleeding is a drip of blood after pooping and is bright red blood, while there may be a localized swelling that protrudes and is of a softer texture. Hemorrhoids are more likely to occur due to the increased abdominal pressure caused by the pressure of the fetus on the abdominal cavity during pregnancy. Treatment during pregnancy, it is recommended to choose the drugs that have little effect on the fetus to carry out timely symptomatic treatment, it is recommended to choose warm salt water local fumigation sitz bath, at the same time adjusting lifestyle habits, avoid constipation, timely laxative, avoid spicy, stimulating diet, eat more fresh vegetables, fruits. If the 18 weeks of pregnancy found poop bleeding, it is recommended to go to the regular specialist hospital systematic examination, clear diagnosis and give timely and effective symptomatic treatment.