Hemorrhoids Hemorrhoids are swollen veins in or around the rectum and anus. They are common and can happen from straining, constipation, pregnancy, prolonged sitting, diarrhea, heavy lifting, low-fiber intake, or increased pressure in the pelvic area. Hemorrhoids can be uncomfortable, but many mild cases improve with home care. However, rectal bleeding should not automatically be assumed to be “just hemorrhoids,” especially if it is new, heavy, persistent, or associated with