A patient who feels ill and complains of chills, fever and pain in the rectum
or anus could be suffering from an anal abscess or fistula. These medical terms
describe common ailments about which many people know little.
What Is An Anal Abscess?
An anal abscess is an infected cavity filled with pus found near the anus or
Is An Anal Fistula?
An anal fistula, almost always the result of a previous abscess, is a small
tunnel connecting the anal gland from which the abscess arose to the skin of
the buttocks outside the anus.
What Causes An Abscess?
An abscess results from an acute infection of a small gland just inside the
anus, when bacteria or foreign matter enters the tissue through the gland.
Certain conditions - colitis or other inflammation of the intestine, for example
- can sometimes make these infections more likely.
What Causes A Fistula?
After an abscess has been drained, a tunnel may persist connecting the anal
gland from which the abscess arose to the skin. If this occurs, persistent
drainage from the outside opening may indicate the persistence of this tunnel.
If the outside opening of the tunnel heals, recurrent abscess may develop.
What Are The Symptons Of an Abscess Or Fistula?
Symptoms of both ailments include constant pain, sometimes accompanied by swelling
that is not necessarily related to bowel movements. Other symptoms include
irritation of skin around the anus, drainage of pus (which often relieves the
pain), fever, and feeling poorly in general.
Does An Abscess Always Become a Fistula?
No. A fistula develops in about 50 percent of all abscess cases, and there
is really no way to predict if this will occur.
How Is An Abscess Treated?
An abscess is treated by draining the pus from the infected cavity, making
an opening in the skin near the anus to relieve the pressure. Often, this can
be done in the doctor's office using a local anesthetic. A large or deep abscess
may require hospitalization and use of a different anesthetic method. Hospitalization
may also be necessary for patients prone to more serious infections, such as
diabetics or people with decreased immunity. Antibiotics are not usually an
alternative to draining the pus, because antibiotics are carried by the blood
stream and do not penetrate the fluid within an abscess.
About Treatment For A Fistula?
Surgery is necessary to cure an anal fistula. Although fistula surgery is usually
relatively straightforward, the potential for complication exists, and is preferably
performed by a specialist in colon and rectal surgery. It may be performed
at the same time as the abscess surgery, although fistulae often develop four
to six weeks after an abscess is drained sometimes even months or years later.
Fistula surgery usually involves cutting a small portion of the anal sphincter
muscle to open the tunnel, joining the external and internal opening and converting
the tunnel into a groove that will then heal from within outward. Most of the
time, fistula surgery can be performed on an outpatient basis - or with a short
How Long Does It Take Before Patients Feel Better?
Discomfort after fistula surgery can be mild to moderate for the first week
and can be controlled with pain pills. The amount of time lost from work or
school is usually minimal.
Treatment of an abscess or fistula is followed by a period of time at home,
when soaking the affected area in warm water (sitz bath) is recommended three
or four times a day. Stool softeners may also be recommended. It may be necessary
to wear a gauze pad or mini-pad to prevent the drainage from soiling clothes.
Bowel movements will not affect healing.
What Are The Chances Of A Recurrance Of An Abscess
If properly healed, the problem will usually not return. However, it is important
to follow the directions of a colon and rectal surgeon to prevent recurrence.
Reference: American Society
of Colon and Rectal Surgeons