How can a person increase dietary fiber to help manage an anal fissure?

Medical Advisory BoardAll articles are reviewed for accuracy by our Medical Advisory Board
Educational purpose only • Exercise caution as content is pending human review
Article Review Status
Submitted
Under Review
Approved

Last updated: May 7, 2025View editorial policy

Personalize

Help us tailor your experience

Which best describes you? Your choice helps us use language that's most understandable for you.

From the Guidelines

To increase fiber in your diet for healing an anal tear, gradually add more fiber-rich foods while ensuring adequate hydration, aiming for 25-30 grams of fiber daily from sources like whole grains, fruits, vegetables, legumes, nuts, and seeds, as recommended by the most recent guidelines 1.

Key Recommendations

  • Start with a small dose of fiber supplement like psyllium husk (Metamucil), methylcellulose (Citrucel), or wheat dextrin (Benefiber) and gradually increase to avoid gas or bloating.
  • Drink at least 8-10 glasses of water daily, as fiber absorbs water to form softer, bulkier stools that pass more easily without straining.
  • Maintain a higher fiber intake even after healing to prevent recurrence of anal tears.

Rationale

The American Gastroenterological Association recommends a daily fiber intake of 25-30 grams for overall health, and recent studies suggest that soluble fiber is efficacious in treating global symptoms of irritable bowel syndrome (IBS) 1.

Additional Considerations

  • Pregnant individuals can also benefit from increased dietary fiber intake to prevent constipation and promote regular bowel movements, with a recommended daily amount of approximately 30 g/d 1.
  • Bulk-forming agents like psyllium husk or methylcellulose are safe to administer during pregnancy due to lack of systemic absorption.
  • Osmotic laxatives like polyethylene glycol or lactulose can also be administered safely during pregnancy, but stimulant laxatives should be avoided due to conflicting safety data.

From the FDA Drug Label

As your body adjusts to increased fiber intake, you may experience changes in bowel habits or minor bloating. New Users:Start with 1 dose per day; gradually increase to 3 doses per day as necessary.

To help with anal tear, a person can increase fiber in their diet by:

  • Starting with a low dose of fiber supplement, such as psyllium, and gradually increasing the dose as necessary 2
  • Mixing the fiber supplement with at least 8 ounces of water or other fluid to help prevent thickening and promote gentle bowel movements
  • Increasing fiber intake slowly to allow the body to adjust and minimize potential side effects, such as bloating
  • Considering a fiber supplement like methylcellulose, which is gentle and clinically proven effective for relieving occasional constipation 3 Key points:
  • Increase fiber intake gradually
  • Use a fiber supplement with at least 8 ounces of fluid
  • Start with a low dose and adjust as needed

From the Research

Increasing Fiber Intake to Help with Anal Tear

To increase fiber in the diet and help with anal tear, the following points can be considered:

  • Increasing fiber intake may improve symptoms of chronic constipation, which can contribute to anal tears 4
  • A higher fiber intake, particularly with doses greater than 10g/day, can improve stool frequency and consistency, reducing the risk of anal tears 4
  • Psyllium and pectin are types of fiber that have been shown to have significant effects on improving constipation symptoms 4
  • A low intake of dietary fiber may be a risk factor for anal fissures, which are a type of anal tear 5
  • Conservative management of anal fissures, including increasing fiber intake and taking warm baths, can result in healing of approximately half of all anal fissures 6

Foods High in Fiber

Some examples of foods that are high in fiber include:

  • Fruits, such as berries, apples, and bananas
  • Vegetables, such as broccoli, carrots, and Brussels sprouts
  • Legumes, such as beans, lentils, and peas
  • Whole grains, such as brown rice, quinoa, and whole wheat bread
  • Nuts and seeds, such as almonds, chia seeds, and flaxseeds

Treatment of Anal Fissures

It's worth noting that while increasing fiber intake can help with anal tears, it's also important to seek medical attention if symptoms persist or worsen. Treatment options for anal fissures may include:

  • Conservative management, such as increasing fiber intake and taking warm baths 6
  • Pharmacologic options, such as topical creams or ointments 6
  • Surgical options, such as lateral internal sphincterotomy 5, 6, 7

References

Guideline

Guideline Directed Topic Overview

Dr.Oracle Medical Advisory Board & Editors, 2025

Research

Anal fissure (chronic).

BMJ clinical evidence, 2014

Research

Anal fissure.

Clinics in colon and rectal surgery, 2011

Research

Treatment for anal fissure: Is there a safe option?

American journal of surgery, 2017

Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.

Have a follow-up question?

Our Medical A.I. is used by practicing medical doctors at top research institutions around the world. Ask any follow up question and get world-class guideline-backed answers instantly.