This article is for information purposes only; it is not a substitute for an examination and a physician’s assessment.
Constipation is the fissure's number one cause: hard stool tears open the exit of the canal. But the relationship is not one-way — fissure pain creates fear of the toilet, fear delays the stool, delay hardens it, and that deepens the constipation. Until this two-way cycle is broken, the wound will not close. The solution works both ends at once: a routine that softens the stool (fiber + water + an osmotic softener if needed) and care that relieves the pain (warm baths + the right medication).
I ask my fissure patients the same question every time: "How long have you been constipated?" The answer is usually either "since childhood" or "it got worse in recent months" — and the beginning of the story is almost always there. But by the time they come in, something interesting has happened: the constipation has gotten even worse after the fissure. That's no coincidence; it's a cycle in which the two conditions feed each other — and that cycle is exactly what this article is about.
Direction one: how does constipation open a fissure?
The exit of the anal canal is a tissue with limited elasticity and a rich nerve supply. The forced passage of a hard, bulky, dry stool — especially combined with straining — opens a millimetric tear in this tissue. Once opened, the tear reopens with every subsequent hard stool: the wound never gets a chance to close. Constipation has other accomplices too — a low-fiber diet, too little water, inactivity, the habit of postponing the toilet, and certain medications (iron supplements, codeine-containing painkillers) — but the final common pathway is always the same: hard stool, delicate gate.
Direction two: how does a fissure deepen constipation?
This is the lesser-known half of the cycle. The knife-like pain of a fissure leaves a powerful imprint in the brain: "toilet = pain." The patient — often without even realizing it — starts postponing the toilet. As the waiting stool sits in the bowel, its water is reabsorbed; the stool grows, dries, and hardens. The next bowel movement hurts more, the postponing gets stronger... In children this cycle goes as far as withholding stool for days; in adults it runs quieter but by the same mechanics. The result is paradoxical: constipation starts the fissure, but the fissure manufactures its own constipation.
Breaking the cycle from both ends
Why isn't tackling one end enough? If you only soften the stool but the pain continues, the postponing reflex persists. If you only relieve the pain but the stool stays hard, every trip to the toilet reopens the wound. That is why the plan has two wings. The stool wing: 25-30 grams of fiber a day, 2 liters of water, regular walking; if that's not enough, an osmotic softener (lactulose/macrogol — not habit-forming, explained in the medication article). The goal: strain-free, paste-consistency stool, every other day or more often. The pain wing: a 10-15 minute warm sitz bath after every bowel movement, paracetamol if needed, and a muscle-relaxing cream if your physician has prescribed one. Once the pain stops, the postponing reflex fades — the psychological leg of the cycle breaks. The full daily routine is in the "what to do" guide.
Toilet habits: small adjustments, big difference
Go when the urge comes (after breakfast is the bowel's most willing hour — use that window), don't exceed 5 minutes on the toilet, don't strain, and put a small step under your feet (with knees above hip level, the canal straightens and stool passes without forcing). These four adjustments are the daily maintenance of the constipation-fissure pair.
If constipation is chronic: investigate the underlying cause
Treating the fissure while ignoring the constipation is putting out the fire and leaving the match in place — recurrence becomes inevitable. Constipation that has lasted months and doesn't respond to lifestyle changes needs its own workup: an underactive thyroid, medication side effects, a sluggish bowel, and — over age 40 — anything that has newly changed your bowel pattern. A fissure is sometimes the messenger at the door for a deeper disorder.
Frequently asked questions
I'm not constipated, but I got a fissure — how?
The fissure has other gates too: severe bouts of diarrhea, childbirth, prolonged sitting, and mechanical strain. The causes are covered in the guide article.
Is not going every day constipation?
No — frequency is individual; anywhere from three times a day to three times a week is a wide normal range. The measure of constipation is consistency and straining more than frequency: stool that is hard, requires straining, or leaves a feeling of incomplete emptying is constipation.
Will I become dependent on softeners?
Osmotic softeners (lactulose, macrogol) are not habit-forming; it's the regular use of stimulant laxatives that makes the bowel lazy. The difference between the two matters — ask your physician, not the label.
Despite the routine, the constipation and fissure keep coming back — what should I do?
Two possibilities need assessing together: the fissure may have become chronic (the steps toward a lasting solution come into play), and the constipation may have an organic cause. Both call for an examination — don't get used to the cycle.
Sources
- American Society of Colon and Rectal Surgeons (ASCRS), fascrs.org
- NHS — Constipation / Anal fissure, nhs.uk
Let's map your cycle in a single examination — and solve both ends at once: 444 8 623, Levent.
Content owner: Yasir Gozu, MD
Published: July 17, 2024
Last updated: July 8, 2026
