AI Summary Overview
What is Anal Fistula?
An anal fistula is an abnormal tunnel that connects the anal canal to the skin around the anus. It most commonly develops when an infected anal gland forms an abscess that oozes but does not heal completely, leaving behind a persistent passage. Although it affects the same area of the body, an anal fistula is different from an anal fissure or haemorrhoids and requires a different approach to treatment.
What are the Types of Anal Fistula?
Anal fistulas can be classified depending on their route through the anal sphincter muscles. The standard classification used is the Parks Classification. The types of anal fistula are:
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Intersphincteric Fistula This is the most common type of anal fistula. The tract passes between the internal and external sphincter muscles and opens near the anus. Many low intersphincteric fistulas are considered simpler to treat.
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Transsphincteric Fistula This type of anal fistula passes through both the internal and external sphincter muscles. It may be more complex because the sphincter muscles help control bowel movements. Treatment is usually planned carefully to reduce the risk of faecal incontinence.
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Suprasphincteric Fistula This type of anal fistula starts between the sphincter muscles and passes above the external sphincter before reaching the skin. It is usually more complex and may need specialised surgical treatment.
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Extrasphincteric Fistula This is a less common and complex type of anal fistula. The tract passes from the rectum to the skin around the anus while bypassing the sphincter muscles. It may be linked with conditions such as Crohn's disease, injury, previous surgery or pelvic infection.
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Simple and Complex Fistulas Simple fistulas usually involve a small part of the sphincter muscle and have a single tract. Complex fistulas may involve more sphincter muscle, multiple tracts, recurrent abscesses or associated conditions such as Crohn's disease, tuberculosis, diabetes or previous radiation therapy.
How Common is Anal Fistula in India?
Anal fistula is an increasing anorectal problem in India, ranking 8th in terms of global prevalence. Most cases develop after an anal abscess, while some may be linked to tuberculosis, Crohn's disease or inflammatory bowel disease.
The condition is also suspected to be underreported due to the enormous rural population of India, where access to healthcare facilities is limited and a general lack of awareness. Moreover, many people delay medical consultation due to embarrassment, lack of awareness or fear of surgery. This delay can increase the risk of recurrent infection and the formation of a complex fistula.
What are the Symptoms of an Anal Fistula?
Symptoms of the disease will differ according to the type, grade, and state of activity or obstruction in the fistula. While some individuals experience mild symptoms, some may experience pain and problems that can interfere with their daily activities.
Common early warning signs and advanced stage symptoms of anal fistula include:
| Early Warning Signs | Advanced / Severe Stage Symptoms |
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Stages of Anal Fistula
Anal fistula is categorised by grading rather than staging, depending on its severity and complexity. Garg's classification is the most accurate grading method used today. Anal fistula is a progressively severe condition with five different grades. These grades are:
| Grade | Features |
| Grade I: Simple Low Fistula | Single low tract; less than one-third of the external sphincter is involved; usually simpler to treat. |
| Grade II: Complex Low Fistula | Low fistula with secondary tracts or abscess; needs careful surgical planning. |
| Grade III: High Fistula with Comorbidities | More sphincter involvement or associated conditions, such as Crohn's disease, diabetes, sphincter injury, or previous radiation. |
| Grade IV: High Fistula without Comorbidities | A high fistula in an otherwise healthy person usually needs sphincter-sparing treatment. |
| Grade V: Suprasphincteric or Extrasphincteric Fistula | Most complex type; tract passes above or outside the sphincter; needs specialised surgical care. |
Grades I and II are simple fistulas suitable for fistulotomy. Grades III to V are complex fistulas that must be managed by a specialist colorectal surgeon using sphincter-preserving techniques.
Diseases Similar to Anal Fistula
Anal fistula can be mistaken for other anorectal problems, such as haemorrhoids (piles) or anal fissure, because they may also cause anal pain, swelling, bleeding, itching, or discharge. This makes it important to understand how they differ.
A basic overview of these diseases is given below for easier identification:
Anal Fistula Vs. Anal Fissure Vs. Haemorrhoids (Piles)
| Feature | Anal Fistula | Anal Fissure | Haemorrhoids |
| How It Happens | An abnormal tunnel forms between the anal canal and the skin near the anus | A small tear develops in the lining of the anus | Swollen blood vessels develop in or around the anus |
| Location | Around the anus, with an internal and external opening | Anal lining, usually at the edge of the anus | Inside the rectum or around the anal opening |
| Associated Symptoms | Pus or fluid discharge, anal pain, swelling, itching, recurrent boil, foul smell | Sharp pain during stool passage, burning, bright red bleeding and spasm | Bleeding during stool passage, itching, swelling, lump, discomfort while sitting |
| Severity | Usually needs medical or surgical treatment | Often heals with medicines, stool softeners, and diet changes | Mild cases improve with lifestyle care; severe cases may need procedures |
| Can It Be Reversed? | Usually does not heal fully without treatment | Yes, many cases heal with proper care | Yes, symptoms can improve; recurrence is possible |
What Causes an Anal Fistula?
The most common cause of an anal fistula is an infected anal gland that evolves into an abscess.
The causes of anal fistula include:
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Anal Abscess: The most common cause. A pus-filled swelling near the anus may burst or drain, leaving a fistula tract behind.
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Crohn's Disease: This inflammatory bowel disease can cause long-term inflammation and ulcers in the digestive tract, increasing the risk of anal fistula.
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Previous Anal or Rectal Surgery: Surgery in the anal or rectal area can sometimes lead to fistula formation.
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Tuberculosis: TB infection can sometimes affect the anal or rectal region and form a fistula, especially in high-risk patients.
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Radiation Therapy: Radiation given for pelvic cancers may damage tissues and increase the risk of a fistula.
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Trauma or Injury: Injury around the anus or rectum may sometimes result in an abnormal tract.
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Cancer: In rare cases, cancers of the anus or rectum may be associated with fistula-like openings or non-healing tracts.
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Sexually Transmitted Infections: Certain sexually transmitted infections affecting the anal or rectal area may sometimes contribute to fistula formation.
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Diverticulitis: In rare cases, severe or recurrent diverticulitis may lead to abnormal fistula formation in the lower digestive tract.
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Weak Immune System: People with reduced immunity, such as those with HIV, uncontrolled diabetes, cancer treatment, or long-term steroid use, have a higher risk.
What are the Complications of Anal Fistula?
An untreated anal fistula can result in severe consequences that impact general health and quality of life. Common complications associated with anal fistula are:
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Recurrent Anal Abscess: The fistula tract may repeatedly get blocked and infected, leading to painful pus-filled swelling near the anus.
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Persistent Pus or Blood Discharge: Ongoing drainage from the external opening can cause discomfort, staining of clothes, foul smell, and skin irritation.
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Skin Irritation and Infection: Constant moisture and discharge may lead to itching, redness, soreness, or secondary skin infection around the anus.
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Multiple Fistula Tracts: Untreated or complex fistulas may branch into multiple tracts, making treatment more difficult.
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Faecal Incontinence: Damage to the anal sphincter muscles due to complex fistulas or repeated surgery may cause difficulty controlling stool or gas.
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Delayed Wound Healing: People with diabetes, Crohn's disease, tuberculosis, or weakened immunity may experience slower healing and a higher risk of recurrence.
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Recurrence After Treatment: In some cases, fistulas can come back even after surgery, especially if the tract is complex or the underlying cause is not treated.
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Rare Cancer Risk: Long-standing and non-healing fistulas may rarely be linked with cancer, especially in chronic inflammatory conditions such as Crohn's disease.
When Should I See My Healthcare Provider?
Consult your doctor straightaway if you have any of the following:
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Pain, swelling, or redness around the anus
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Pus, blood, or foul-smelling discharge near the anus
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A small opening or boil near the anal area
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Pain while sitting, walking or passing stool
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Recurrent anal abscess or swelling
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Itching, irritation or soreness around the anus
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Fever, chills, or feeling unwell
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Symptoms that improve and then return
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Loss of control over stool or gas
Urgent care is needed if you have severe anal pain, high fever, rapidly increasing swelling, heavy bleeding, or difficulty passing stool.
How is Anal Fistula Diagnosed?
Diagnosis of anal fistula involves a physical exam and investigations. The doctor may prescribe multiple tests to understand the severity of the condition. An overview of the diagnosis process that the doctor may implement for an anal fistula is given in the table below:
| Test | Purpose | What the Doctor Checks |
| Physical Examination | To look for visible signs of an anal fistula | External opening near the anus, swelling, redness, tenderness, pus or blood discharge |
| Digital Rectal Examination | To assess the anal canal and surrounding tissues | Internal opening, pain, lump, abscess, sphincter involvement, tenderness |
| Proctoscopy/ Anoscopy | To view the inside of the anal canal and lower rectum | Internal fistula opening, inflammation, pus discharge, haemorrhoids, fissures, or other anal conditions |
| MRI Fistulogram / MRI Pelvis | To map the fistula tract clearly, especially in complex cases | Fistula path, branches, abscess, sphincter muscle involvement, complex or recurrent tracts |
| Endoanal Ultrasound | To assess the anal sphincter and fistula tract | Sphincter involvement, internal opening, hidden abscess, tract depth |
| Fistulography, selected cases only | To outline the fistula tract using contrast dye | Direction, length, and branching of the fistula tract |
| CT Scan, selected cases only | To check for deep infection or abscess in complicated cases | Deep pelvic abscess, spread of infection, complex anatomy |
| Colonoscopy (if Crohn's disease is suspected) | To check for inflammatory bowel disease | Ulcers, inflammation, narrowing, bleeding, or Crohn's-related bowel changes |
| Blood Tests | To check for infection and underlying health issues | Raised infection markers, anaemia, diabetes, immune status and fitness for surgery |
How is Anal Fistula Treated?
All anal fistulas generally require surgical or medical treatment and do not heal on their own. Treatment methods of anal fistula include:
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Conservative Management Warm sitz baths, hygiene measures, pain relief and antibiotics may reduce discomfort or control infection. However, these measures usually do not close the fistula tract permanently.
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Fistulotomy Fistulotomy is commonly used for simple, low fistulas. The fistula tract is opened so it can heal from the inside out. It is usually effective for simple fistulas but is not preferred when there is a high risk of sphincter damage.
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Seton Placement A seton is a thread or surgical material placed through the fistula tract. It helps in pus drainage and reduces infection. It may be used before another procedure, especially in complex fistulas.
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LIFT Procedure LIFT stands for ligation of the intersphincteric fistula tract. It is a sphincter-sparing procedure used for selected fistulas that involve sphincter muscles.
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Advancement Flap Procedure In this procedure, the internal opening of the fistula is covered using nearby tissue. It may be used when preserving sphincter function is important.
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Laser Fistula Surgery Laser treatment may be used in selected fistulas. It is a less invasive option and aims to close the fistula tract with minimal or no incisions. Suitability depends on the fistula type and the surgeon's assessment.
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Fibrin Glue and Bioprosthetic Plug These methods aim to seal the fistula tract. They may be considered in selected complex or recurrent fistulas, but success rates can vary.
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Treatment for Crohn's-Related Fistulas If the fistula is linked with Crohn's disease, medicines to control inflammation may be needed, along with drainage or surgery. A gastroenterologist and colorectal surgeon usually manage the treatment.
Common Medicines Used to Treat Anal Fistula
Medicines are usually used in anal fistula to control and manage symptoms. A surgical or procedural treatment is usually required to completely close the tract.
Common medicines used to treat anal fistula include:
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Amoxicillin-Clavulanate, Cefixime, or Cefuroxime: Doctors may prescribe these antibiotics if there is bacterial infection, pus discharge, cellulitis, or abscess-related infection.
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Metronidazole or Tinidazole: These medicines may be used along with other antibiotics to cover anaerobic bacteria, especially when there is foul-smelling discharge or deeper infection.
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Ciprofloxacin or Ofloxacin: These antibiotics may be used in selected cases, especially when broader gut bacteria coverage is needed.
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Paracetamol, Ibuprofen, or Diclofenac: These medicines may help reduce pain and discomfort. NSAIDs, such as ibuprofen or diclofenac, should be used only if suitable for the patient.
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Lactulose, Isabgol, or Polyethylene Glycol: These stool softeners or fibre-based medicines may help prevent constipation and reduce pain during bowel movements.
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Povidone-Iodine or Chlorhexidine Solution: These antiseptic solutions may be advised for local cleaning in selected cases, as directed by the doctor.
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Mesalamine, Azathioprine, or Steroids: These may be used if the fistula is linked to Crohn's disease or inflammatory bowel disease, under specialist supervision.
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Infliximab or Adalimumab: These biologic medicines may be prescribed for complex Crohn's-related fistulas when advised by a gastroenterologist.
Note: Choice of medications depends on the severity of the patient's condition and the existence of other factors like pregnancy and other conditions like liver or kidney disease (if any). Medicines should be taken only under medical supervision.
Living with Anal Fistula: Challenges and Caregiving
Living with an anal fistula can be physically and psychologically difficult. Pain and continued abscess drainage can pose significant problems in daily life. Some of the critical challenges and caregiving points for anal fistula patients are listed below:
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Challenges
- Pain and Discomfort: Continued pain, swelling, and tenderness may limit the mobility of the patient.
- Persistent Discharge: Pus and blood or foul-smelling fluid discharge can stain clothes and cause itching and skin irritation.
- Recurrent Infection: The fistula tract may repeatedly become infected. This can result in abscess formation and cause fever or worsening pain.
- Emotional Stress: Emotional burden and fear of surgery may delay medical consultation and treatment.
- Work and Daily Activity Limitations: Frequent pain, wound care and recovery after surgery may affect work attendance and daily activities.
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Caregiving and Patient Safety
- Hygiene Support: Keeping the anal area clean and dry can help reduce irritation and the risk of secondary infection.
- Wound and Discharge Monitoring: Caregivers should watch for increasing pus, bleeding, swelling, foul smell, fever, or worsening pain.
- Medicine and Dressing Support: Antibiotics, pain medicines, stool softeners, sitz baths, and dressings should be used only as advised by the doctor.
- Diet and Bowel Care: A fibre-rich diet, adequate fluids, and prevention of constipation can reduce strain during bowel movements.
- Follow-Up Care: Regular follow-up is important after surgery or procedures, especially for complex, recurrent, or Crohn's-related fistulas.
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Expenses
- Medical Visits and Tests: Anal fistula care may involve consultations with a surgeon, an MRI fistulogram, an ultrasound, blood tests, and follow-up appointments.
- Medicines and Dressings: Patients may need antibiotics, pain relief medicines, stool softeners, antiseptic solutions, wound dressings, or sitz bath support.
- Surgery and Long-Term Care: Many fistulas require surgical or procedural treatment. Complex or recurrent fistulas may need repeated procedures, longer wound care, and extended follow-up.
Anal Fistula and Tuberculosis
Tuberculosis can be an important cause of recurrent or non-healing anal fistula in India. Doctors may suspect TB-related fistula when there are multiple tracts, repeated recurrence, poor healing after surgery, associated weight loss, fever or other TB symptoms.
Diagnosis may involve pus or tissue testing, PCR/CBNAAT, biopsy, culture or imaging, depending on the case. Anti-tuberculosis treatment is needed when TB is confirmed. Doctors may plan surgery along with infection control.
What is the Prognosis for Anal Fistula?
The prognosis is usually favourable when an anal fistula is diagnosed early and treated properly. Simple fistulas often heal well after appropriate surgery. Complex fistulas may need staged treatment and have a higher risk of recurrence.
Recovery usually depends on the fistula type and sphincter involvement, along with the presence of conditions like Crohn's disease, tuberculosis or diabetes and the surgical method used. Most patients should resume normal activities within 2-3 weeks of the operation. Regular follow-up with the specialist is important for a better recovery.
How Can I Prevent an Anal Fistula?
Complete prevention of an anal fistula is not always possible, but its risk can be reduced by treating anal infections early and maintaining good bowel habits.
Some helpful preventive measures for anal fistula include:
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Go for an anal abscess evaluation early.
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Avoid delaying care for painful swelling near the anus.
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Maintain anal hygiene.
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Eat a high-fibre diet.
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Drink enough water.
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Avoid constipation and straining.
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Manage diabetes and inflammatory bowel disease properly.
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Get evaluated for TB if fistulas are recurrent or non-healing.
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Practise safe sex to reduce the risk of sexually transmitted infections.
Anal Fistula Treatment Cost in India
The cost of treatment for anal fistula varies in India depending on the grade of the fistula, the nature of the surgical procedure involved, the city, and the type of hospital. Treatment costs can also depend on other associated diseases, like Crohn's disease and tuberculosis, which may need to be managed along with the fistula.
The monthly expense for anal fistula treatment in India may range from around ₹1,000 to ₹5,000. However, this expense can increase significantly if diagnostic procedures like MRI and ultrasound are involved. For patients requiring hospitalisation, costs incurred can cross ₹1 lakh, depending on complications and the type of surgery advised.
The cost of different treatment components of anal fistula is as follows:
| Treatment Component | Approximate Cost Range |
| Colorectal Surgeon/ General Surgeon Consultation | ₹500 - ₹2,000 per visit |
| MRI (Fistula Mapping) | ₹3,000 - ₹15,000 per scan |
| Endoanal Ultrasound (if required) | ₹2,000 - ₹6,000 per procedure |
| Fistulotomy (simple fistula) | ₹30,000 - ₹80,000 per procedure |
| LIFT Procedure (complex fistula) | ₹50,000 - ₹1,00,000+ per procedure |
| Laser Fistula Surgery (FiLaC) | ₹50,000 - ₹1,00,000+ per procedure |
| Advancement Flap Surgery | ₹60,000 - ₹1,00,000+ per procedure |
| Antibiotics (if prescribed) | ₹500 - ₹2,000 per course |
| Infliximab Infusion (Crohn's-related fistula) | ₹25,000 - ₹70,000+ per infusion |
| Hospitalisation (if considered separately) | ₹20,000 - ₹1,00,000+ per admission |
Note: Costs may vary based on hospital tier, city, and whether generic or branded medicines are prescribed. Consult a doctor for more accurate estimates.
Does Health Insurance Cover Anal Fistula?
Yes, several health insurance policies in India may cover medically necessary treatment for anal fistula, including:
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Hospitalisation
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Surgery
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Diagnostic tests and post-operative care
Some plans may also cover daycare procedures, including selected minimally invasive treatments, depending on policy terms.
Policy coverage depends on the insurer, plan type, waiting periods, exclusions, and whether the condition was pre-existing. If an anal fistula, Crohn's disease or another related condition existed before purchasing the policy, a pre-existing disease waiting period of 1 to 3 years may apply.
Thus, review policy details carefully to understand plan benefits before raising a claim for an anal fistula.
How Much Health Insurance Coverage is Needed for Anal Fistula Treatment?
Based on the type of fistula, method of treatment, hospital and city of treatment, the right coverage required may vary. For standard anal fistula treatment and surgery, a mediclaim policy coverage of ₹5 to ₹10 lakh should suffice.
For complex, recurrent or Crohn's-related fistulas, costs may be higher due to MRI scans, staged surgeries, longer hospital stays, biologic medicines and routine follow-ups. In such cases, a higher cover of ₹15 lakh to ₹20 lakh may be beneficial to cover additional expenses.
Make sure to compare the benefits and coverage of different plans to choose one that best suits your requirements.
FAQs
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Q1. What is an anal fistula?
Ans: An anal fistula is an abnormal tunnel that forms between the anal canal and the skin near the anus. It usually develops after an anal abscess does not heal completely. -
Q2. What are the primary symptoms of an anal fistula?
Ans: Common symptoms include pain around the anus, pus or blood discharge, swelling, skin irritation, recurrent abscesses, and pain while sitting or passing stool. -
Q3. Will an anal fistula heal on its own?
Ans: No, most anal fistulas do not heal without treatment. While antibiotics and sitz baths may relieve symptoms, surgery is usually needed to treat the fistula.
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References
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https://irdai.gov.in/health-dept
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https://www.ncbi.nlm.nih.gov/books/NBK560657/
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