can hemorrhoids cause change in stool
can hemorrhoids change stool appearance. A hemorrhoid is an enlarged vein in the anus (it's also called a varicose vein). In a healthy person, the tissue around the anus fills with blood to regulate bowel movements. However, when there is constant pressure or other factors restricting blood flow, the veins become inflamed. Poor blood flow may cause a blood clot. That results in a painful, swollen, protruding hemorrhoid.