PILES.
Piles is just a mass of dilated and tortuous veins that occur in the anal canal. Simple fact and surprising, isn't it?
These dilated veins arise from under the mucous membrane in the lower rectum. They form a mass containing several branches of veins which descend down the anal canal giving rise to piles. Such piles may be external (Present and visible at the anus) or internal (within the anus and required internal examination to confirm its presence) to the anal orifice.
The external type is covered by skin while the internal is covered by mucous membrane. Both of these may be present in the same individual. It is these dilated veins that cause bleeding, pain and other discomfort at the anus.Read More...
FISTULA.
A "Fistula in Ano" is a track, lined by granulation tissue, which connects internally the anal canal or rectum with externally the skin around the anus. It usually results from an anorectal abscess, which bursts spontaneously or was opened surgically. This track once formed does not heal on its own and causes recurrent infection, discharge of pus, bleeding, pain, itching, fever etc. such a fistula needs surgical intervention.
You can see how a Fistula grows with this animation. Further below is a list of pages that will help you understand Fistula better. Read More...
FISSURE.
A "fissure" is an elongated ulcer in the long axis of the lower anal canal. "Fissure-in-Ano"(the medical term) is a disorder when a fissure or ulcer occurs on the anal verge. This causes excruciating pain and/or bleeding while passing motion. The pain may last for few minutes or may persist for few hours or may be present throughout the day.
You can see how a Fissure grows with this animation. Further below is a list of pages that will help you understand Fissure better Read More...