1) Hemorrhoid 2) Hurting 3) Pain 4) Piles 1) Hemorrhoid 2) Piles 
(Gr. haimorrhois) a varicose dilatation of a vein of the superior or inferior haemorrhoidal plexus, resulting from a persistent increase in venous pressure.
Haemorrhoids are swollen blood vessels in the anus. They are caused by increased blood volume and pressure from the uterus on the veins in the legs and pelvis, and are common during pregnancy. Constipation can also cause (or compound) the problem.
Denoting one of the tumours or varices constituting haemorrhoids. ... (05 Mar 2000) ... 
Painful swelling of veins of the anus. 
a bulging vein either at the opening of the anus or just inside the anus, often caused by childbirth or straining during bowel movements 
Greek haima = blood, and rhoia = to flow, hence likely to bleed.