An anal fistula is usually caused by an infected anal gland that forms an abscess, which then drains and leaves an abnormal tunnel between the anal canal and the skin. Most cases begin as a blocked, infected gland near the anus. Other triggers include Crohn's disease, tuberculosis, trauma, and prior surgery. This article explains the main anal fistula causes, key risk factors, common symptoms, how doctors diagnose it, and the treatment options available at Lux Hospitals so you know when to seek expert care.
What Is an Anal Fistula?
An anal fistula is a small abnormal tunnel connecting the inside of the anal canal to the skin near the anus. It usually develops after an infection.
The tunnel keeps draining pus or fluid and rarely heals on its own. Understanding an anal fistula helps you see why treatment matters:
- Abnormal tunnel near the anus
- Connects anal canal to skin
- Often follows an abscess
- Rarely heals without surgery
- Causes recurring discharge
Learn more about anal fistula care at Lux Hospitals.
The Main Cause: Anal Gland Infection
The most common of all anal fistula causes is an infected anal gland. Tiny glands inside the anus can become blocked and infected.
When bacteria build up, an abscess forms and later drains, creating a fistula tunnel. Key points about this process:
- Blocked anal gland traps bacteria
- Infection forms a pus pocket
- Abscess bursts or is drained
- A tunnel remains after healing fails
- Accounts for most fistula cases
Don't ignore recurring anal discharge—consult Lux Hospitals today.
Perianal Abscess and Fistula Formation
A perianal abscess is the direct forerunner of most fistulas. When the abscess drains but the tract stays open, a fistula develops.
Proper abscess treatment lowers this risk. Watch for these warning signs of an abscess:
- Painful lump near the anus
- Swelling and redness
- Fever and discomfort
- Pus drainage from skin
- Persistent throbbing pain
Timely incision and drainage of an abscess can prevent fistula formation.
Crohn's Disease and Inflammatory Bowel Disease
Chronic inflammation from bowel disease is another major cause. Conditions like Crohn's disease damage the bowel lining and encourage fistula tracts.
These fistulas can be complex and recurring. Inflammatory conditions linked to fistulas include:
- Crohn's disease
- Ulcerative colitis flares
- Long-term gut inflammation
- Deep tissue ulcers
- Recurrent perianal infections
If you have IBD symptoms, get evaluated by the specialists at Lux Hospitals.
Other Causes of Anal Fistula
Besides infection and IBD, several less common causes can trigger a fistula. These often need specialist evaluation.
Other recognised anal fistula causes include:
- Tuberculosis affecting the anal area
- Injury or trauma to the anus
- Complications after anal surgery
- Radiation treatment to the pelvis
- Sexually transmitted infections
- Cancer in rare cases
Risk Factors That Increase Your Chances
Some people are more prone to developing an anal fistula. Certain habits and health conditions raise the risk.
Common risk factors include:
- Previous perianal abscess
- Diabetes and weak immunity
- Smoking
- Chronic diarrhoea or constipation
- Inflammatory bowel disease
- Prior anal surgery
Reduce your risk—speak with the colorectal team at Lux Hospitals.
Symptoms to Watch For
An anal fistula usually causes ongoing discomfort around the anus. Symptoms often persist despite home care.
You may notice:
- Constant pus or blood discharge
- Pain that worsens when sitting
- Swelling near the anus
- Skin irritation or itching
- Recurrent abscesses
- Fever during infection
Complications of Untreated Fistula
Ignoring a fistula can lead to serious problems over time. The infection may spread or the tract may branch.
Untreated fistulas can cause:
- Repeated painful abscesses
- Complex branching tunnels
- Spreading infection
- Skin and tissue damage
- Rare risk of fistula cancer
- Reduced quality of life
Never delay treatment—early care at Lux Hospitals protects your health.
How an Anal Fistula Is Diagnosed
Diagnosis combines a physical exam with imaging to map the tunnel. Accurate mapping guides the right surgery.
Doctors may use these tools:
- Clinical examination of the area
- Digital rectal examination
- MRI of the pelvis
- Endoanal ultrasound
- Examination under anaesthesia
- Fistula probe assessment
Treatment Options at Lux Hospitals
Treatment depends on the fistula's location and complexity. The goal is to heal the tract while protecting sphincter function.
Lux Hospitals offers a full range of proven procedures:
- Fistulotomy for simple tracts
- Seton placement for complex fistulas
- LIFT surgery to spare muscle
- Laser (FiLaC) fistula treatment
- VAAFT minimally invasive repair
- Advancement flap surgery
Book a consultation at Lux Hospitals to find the right procedure for you.
Why Choose Lux Hospitals?
Lux Hospitals provides expert, personalised care for anal fistula and related conditions. Our team focuses on lasting cure with minimal discomfort.
Patients choose us for:
- Experienced colorectal surgeons
- Advanced laser and minimally invasive options
- Accurate MRI-based mapping
- Sphincter-preserving techniques
- Low recurrence focus
- Compassionate follow-up care
Conclusion
Most anal fistulas begin with an infected anal gland that forms an abscess, though Crohn's disease, tuberculosis, trauma, and prior surgery can also be responsible. Knowing the anal fistula causes helps you recognise early warning signs like persistent discharge, pain, and recurring swelling.
A fistula rarely heals on its own and needs proper medical treatment. With accurate diagnosis and modern, sphincter-preserving techniques, most fistulas can be cured successfully. If you notice ongoing symptoms, don't wait—early evaluation lowers the risk of complications and repeated abscesses. The experienced colorectal team at Lux Hospitals can diagnose your condition and recommend the safest, most effective treatment for lasting relief.
