Hemorrhoids are tiny bulging sacs that form in the veins of the rectal area. They are mainly caused by factors that place excessive stress on these veins. Constipation, diarrhea, heavy lifting, pregnancy, child birth, prolonged periods of sitting or standing, and certain medical conditions such as heart disease or liver disease, are contributing factors to the development of hemorrhoids. The main symptoms of hemorrhoids include rectal bleeding, pain, itching, and burning.