There are several common causes of blood in the stool during pregnancy: the first, more common is hemorrhoids, hemorrhoids are varicose vein masses, usually when abdominal pressure increases or constipation, easily lead to swelling of hemorrhoid veins stasis, hemorrhoid veins rupture and lead to bleeding. The enlarged uterus during pregnancy tends to compress the rectal veins, which obstructs rectal venous reflux and makes the local varices swollen, thus leading to bleeding. The second common cause of bleeding in the stool during pregnancy may also be anal fissures, long-term constipation or increased abdominal pressure, dry stool can easily damage the skin of the anal canal, so that when wiping the stool with blood on the surface of the stool, blood in the stool is usually bright red, accompanied by perianal pain, the blood in the stool can stop after defecation, through the anal visual examination can be clearly seen perianal fissures. Therefore, there are many causes of blood in the stool during pregnancy, the most common being mixed hemorrhoids and anal fissures, as well as other causes such as rectal polyps and rectal adenomas. In this case, you should actively go to the anorectal clinic, where you can perform a rectal examination and, if necessary, anoscopy to clarify the diagnosis.