Be careful:

Both pairs are placed simultaneously.

Generalities:

Hemorrhoids are varicose veins or inflammation of the veins in the rectum and anus. They are also popularly known as piles. Anatomically they are plexuses, bearings or pads of submucosal tissue where the venules and superficial arterioles of the anal canal are contained.

Related pathogens:

Papilloma virus, enterobacter cloacae, among others.