HemorrhoidsThere is no precise definition of hemorrhoids but here are a few for starters:
“What are hemorrhoids? A precise definition of hemorrhoids does not exist, but they can be described as masses or clumps (”cushions”) of tissue within the anal canal that contain blood vessels and the surrounding, supporting tissue made up of muscle and elastic [...]

An anus lump (or anal lump) can form in an external hemorrhoid when blood clots inside of the hemorrhoid. This is known as a thrombosis and can be very painful because the area has many somatic nerves. Somatic nerves are like the nerves of the skin and sense pain unlike the visceral nerves of the [...]