An anorectal abscess is a pocket of pus in the tissue near the end
of the rectum (anus). Most abscesses are caused by a blocked anal gland that
develops an infection.
Other possible causes of an anorectal abscess include:
- Infection in an anal
fissure.
- Complications of diseases that affect the colon, such as
Crohn's disease, inflammatory bowel disease, or
diverticulitis.
- Sexually transmitted diseases.
Symptoms of an anorectal abscess include:
- A painful swelling (mass) around the
anus.
- Drainage of pus from the
anus.
- Fever.
- Pain in or around the
anus.
- Pain when passing stool.
A person should see a health professional if an anorectal abscess
is suspected. Treatment is necessary to prevent worsening of the infection and
serious illness.