It often starts quietly: a tender spot near the anus, a little drainage on your underwear, or a painful lump that seems to come and go. Many people feel embarrassed and wait months before mentioning it to anyone. If that sounds familiar, you are not alone, and the problem is very treatable. Understanding what an anal fistula is can make the first conversation with a doctor far easier.
What Is an Anal Fistula?
An anal fistula is a small tunnel that forms between the inside of the anal canal and the skin around the anus. Inside the canal are tiny glands that help with lubrication. If one of these glands becomes blocked and infected, it can form an abscess, a pocket of pus. When the abscess drains, either on its own or with a procedure, a channel can remain. That lasting channel is the fistula.
Fistulas vary in complexity. Some are short and run just beneath the skin, while others pass through or around the sphincter muscles that control bowel movements. This difference matters because it guides which treatment is safest and most effective.
Common Symptoms
Symptoms can be subtle at first and may be mistaken for hemorrhoids or skin irritation. Signs that suggest a fistula include:
- Ongoing or recurring drainage of pus, blood, or fluid near the anus
- Pain or throbbing, especially when sitting or during a bowel movement
- Skin redness, swelling, or irritation around the opening
- Fever or chills when an abscess is developing
- Occasional foul-smelling discharge
Who Is Affected and Why It Happens
Anal fistulas can occur at any age, but they are most often diagnosed in adults and are more common in men. Most follow an anal abscess. Studies suggest that a substantial portion of people who have an anal abscess go on to develop a fistula.
Other contributors include Crohn's disease and other inflammatory bowel conditions, previous anal surgery or injury, radiation therapy, certain infections such as tuberculosis, and, less commonly, cancer. Because of these links, a careful evaluation is important, especially if you have digestive symptoms as well.
How Fistulas Are Diagnosed
Diagnosis usually begins with a conversation about your symptoms and a physical exam of the area. The doctor may be able to see the external opening and gently feel the path of the tract. In some cases, additional steps are used to map the tunnel and its relationship to the sphincter muscles. These can include anoscopy, endoanal ultrasound, or MRI of the pelvis. Complex or recurrent fistulas, or those linked to inflammatory bowel disease, often benefit from imaging.
Treatment Options
Medications alone generally do not close a fistula, although antibiotics may be used for infection and specific therapies may be used when Crohn's disease is involved. Most people need a procedure. The goal is to eliminate the tract while protecting continence, the ability to control bowel movements.
- Fistulotomy: opening the tract so it heals from the inside out, commonly used for simpler fistulas.
- Seton placement: a soft drain left in the tract to keep it open, relieve infection, and sometimes prepare for a later repair.
- Advancement flap: covering the internal opening with healthy tissue.
- LIFT procedure: closing the tract between the sphincter muscles.
- Fibrin glue or plugs: sealing materials that preserve muscle but may have lower success rates.
The best choice depends on the tract's location, how much sphincter muscle it involves, whether there have been prior repairs, and your overall health. Recovery typically involves some drainage and discomfort, and wound care instructions are an important part of healing.
Practical Tips While You Seek Care
- Seek an evaluation early if you notice persistent drainage, swelling, or pain near the anus.
- Keep the area clean with gentle washing and pat it dry rather than rubbing.
- Eat enough fiber and drink water to avoid constipation and straining.
- Avoid scented wipes, harsh soaps, and powders that may irritate the skin.
- Do not try to squeeze or drain a painful lump yourself.
- Follow up on any treatment plan, since a fistula rarely heals fully on its own.
When to Get Help
Seek prompt care for severe pain, fever, spreading redness, or inability to pass stool, since these can signal an abscess that needs urgent attention. Even if your symptoms are mild, persistent drainage or recurring lumps deserve a professional look. If you are in or near Lancaster, CA, you can call the practice of Aldo Gamarra, MD at (661) 579-6088 to ask about care. A fistula is a common, well-understood condition, and there is no reason to face it with embarrassment or in silence.