How long an anal fissure takes to heal

This is a healing timeline from two public pages opened October 26, 2026. It does not predict one person's course. ahem does not examine people and does not prescribe the medicines named below.

Mayo Clinic's fissure treatment page is dated December 31, 2024. On the copy checked October 26, 2026, it says anal fissures often heal within a few weeks with appropriate home treatment. The home treatment it names first is keeping the stool soft, with more fiber and fluids. The symptoms page from the same day says most anal fissures get better with simple treatments such as more fiber or a warm-water bath, and that some people need medicine or, sometimes, surgery.

MedlinePlus lists a review date of April 11, 2026. Opened October 26, 2026, it says most fissures heal on their own and do not need treatment, and that they often heal quickly without further problems. It does not give a number of weeks. People who develop a fissure once are more likely to have another, on that page. How a fissure differs from a hemorrhoid is on hemorrhoids and anal fissures.

Mayo Clinic uses eight weeks as the line between a fissure that is still in the usual course and one it calls chronic. On the treatment page checked October 26, 2026, a fissure is considered chronic if it lasts more than eight weeks. A more recent tear looks like a fresh tear, somewhat like a paper cut. A long-lasting tear likely has a deeper split and may have internal or external fleshy growths. On the symptoms page, failure to heal within eight weeks is listed as a complication, and that fissure may need further treatment.

MedlinePlus does not print the eight-week line. Its outlook section says fissures often heal quickly, and that another fissure is more likely after a first one. The eight-week figure stays with Mayo Clinic. What a clinician looks for when the tear is not the usual one in the middle is on when an anal fissure needs more tests.

Mayo Clinic's self-care list, checked October 26, 2026, is fiber, fluids, not straining, and a warm bath. Straining creates pressure that can open a healing tear or cause a new one. The bath, which it also calls a sitz bath, is warm water for 10 to 20 minutes several times a day, especially after bowel movements, to soothe the skin and help the sphincter relax. The treatment section says the same soak, 10 to 20 minutes several times a day, especially after bowel movements.

MedlinePlus, reviewed April 11, 2026 and opened October 26, 2026, describes a sitz bath as sitting in warm water 2 to 3 times a day for 10 to 15 minutes, with the water covering the hips and buttocks. It also says to eat more fiber, drink more fluids, and use stool softeners so stools stay softer. Avoiding bowel movements because of pain makes stools harder, which can make the tear worse. The 10 to 20 minute timing is Mayo Clinic's. The 10 to 15 minute timing, two or three times a day, is MedlinePlus. This page does not merge them into one schedule.

For an infant, both pages give a short diaper instruction and stop there. Mayo Clinic says to change diapers often, wash the area gently, and discuss the problem with the child's healthcare team. MedlinePlus says to change diapers often and clean the area gently. The week counts above are the adult pages' course.

Mayo Clinic's fissure treatment page, checked October 26, 2026, says eating about 25 to 35 grams of fiber a day can help keep stools soft and improve fissure healing. It names fruits, vegetables, nuts, and whole grains, and says a supplement is another route. Adding fiber may cause gas and bloating, so the page says to increase it gradually. Fluids help prevent constipation, and the page does not attach a glass count to that sentence.

That 25 to 35 gram range is the fissure page's figure. The hemorrhoid diet page uses a different figure, tied to calories. Those grams, and Mayo Clinic's separate fluid warning for hemorrhoid supplements, are on fiber, fluids, and hemorrhoid symptoms. This fissure page does not average the two ranges.

Mayo Clinic says further treatment is likely if symptoms persist. On the treatment page checked October 26, 2026, externally applied nitroglycerin (Rectiv) can increase blood flow to the fissure and relax the anal sphincter. Mayo Clinic calls it the treatment of choice when other conservative measures fail, and says a side effect may be headache, which can be severe. A topical anesthetic cream such as lidocaine may help pain. OnabotulinumtoxinA injection paralyzes the anal sphincter and relaxes spasms. Nifedipine or diltiazem can relax the sphincter. Those blood-pressure medicines are generally applied to the skin and can also be taken by mouth, with greater side effects by mouth, and may be used when nitroglycerin is not effective or causes serious side effects.

MedlinePlus, reviewed April 11, 2026 and opened October 26, 2026, says to ask a clinician about a numbing cream if pain interferes with bowel movements, and it also names petroleum jelly, zinc oxide, and a 1% hydrocortisone cream. If the fissure does not go away with home care, it says treatment may involve botulinum toxin injection into the sphincter, minor surgery to relax the anal muscle, or prescription creams such as nitrates or calcium channel blockers. The page does not give doses, and this guide does not add any.

For a chronic fissure that has not responded, or for severe symptoms, Mayo Clinic says surgery may be recommended. The usual operation it names is lateral internal sphincterotomy, cutting a small part of the anal sphincter muscle to help healing and to reduce spasm and pain. The page says studies show surgery is much more effective than any medical treatment for chronic fissure, and that surgery has a small risk of causing incontinence. That effectiveness sentence is Mayo Clinic's report of studies. It is a reason to talk with a surgeon, and it is the point where home care has left the page.