An abscess is referred to as a collection of pus. It is a mass of cells that can be easily felt by touch. They occur in pink or deep red in color. The centre of the abscess is filled with pus and debris. An ischiorectal abscess is formed between the muscles tissues of the rectum and the pelvic bone. It may occur instinctively, or is often formed as secondary to an anal fissure or any other diseased condition of the anus. Ischiorectal Abscess can cause severe pain and swelling with fever.

There are several types of abscess formed depending on the location of their formation. Ischiorectal abscess are formed in the deeper tissues of the anal canal. There are six anal canals in the ischiorectal space. This abscess can spread to all anal canals forming a horse shoe shaped abscess. This can also lead to the formation of a fistula between the anal canal and the rectum.

Ischiorectal abscess is the most common type of abscess that is formed as compared to other forms of abscess.

Cause of ischiorectal abscess

There are various reasons that can develop the ischiorectal abscess. Some of the causes are:

  • Blood disorder diseases like leukemia
  • HIV
  • Crohn’s disease
  • Diabetes
  • Anal fissure
  • Hemorrhoids
  • Injury to the anal region
  • Inflammatory bowel disease
  • Infection of the anal glands

Symptoms of ischiorectal abscesses

Most common symptoms associated this ischiorectal abscess include:

  • Severe pain
  • Irritation, swelling and redness of the anal region.
  • Release of pus
  • Constipation
  • Pain during bowel movements
  • Fever
  • bleeding

When the abscess is superficial the person can actually feel the lump of swollen mass near the anus. If the abscess is deep seated inside the anal canal, mostly in those having inflammatory bowel diseases can result in discomfort in the abdominal area also.


Treatment to cure ischiorectal abscess is to open and drain the abscess. The procedure begins by injecting meditation to numb the area around the abscess by providing local anesthetic.  The area will be proofed with antiseptic solution to keep the spot sterile. The Surgeon will then cut open the abscess and drain the pus and debris from the abscess. Once the pus is drained completely the surgeon will insert some packing to the cavity to diminish any bleeding and leave it open for a day or two. This cavity will not be stitch closed because this can cause an Infection and the collection of pus. Leaving the abscess open will drain out all the pus and debris completely form the abscess. Later on, a bandage will be placed over the packing of the cavity and provide instruction to take care of the wound.

If pain persists after two days from draining the pus then it’s recommended to visit the doctor for follow ups. Special care should be taken to prevent any infection or bleeding of blood form the spot. It’s important to keep the area hygiene by following instructions provided by the doctor.