The anal swelling, blood in the stool consider diseases common: 1, hemorrhoids embedded combined edema: hemorrhoids are divided into internal and external hemorrhoids, hemorrhoids that hemorrhoids on the venous plexus tortuous expansion caused. The varicose veins are prone to rupture and bleeding under the friction of dry stool, and internal hemorrhoids are prone to impaction combined with edema, which leads to anal swelling and discomfort; 2. Abscess: perianal abscess is a bacterial infection inflammatory disease, and the inflammation stimulates the anus leading to anal swelling. So there are more causes of anal swelling with blood in the stool, regardless of that cause, you need to eat a light diet, avoid spicy and stimulating food, prevent constipation, dry stools, and it is recommended to go to the hospital in a timely manner.