Haemorrhoids- Swollen and inflamed veins in the rectum and anus that cause discomfort and bleeding. Haemorrhoids are usually caused by straining during bowel movements, obesity or pregnancy.
The term "hemorrhoid" refers to engorged or thrombosed veins inside and outside the anus, within and beyond the anal verge. Hemorrhoidal veins are normal veins that everyone has, and they cushion the tissue. Hemorrhoids, on the other hand, are the abnormal growths that occur.
Sometimes hemorrhoids are both internal and external (mixed). In some cases, hemorrhoids that were inside the rectum can protrude out of the anus and become externally visible. (These are called prolapsed hemorrhoids and they are still considered internal hemorrhoids.)
While hemorrhoids have sometimes been described as varicose veins, the conditions are different, so the terms should not be used interchangeably. (Anorectal varicose veins can develop due to certain conditions, such as portal hypertension, and should be evaluated independently of hemorrhoids.)