Most anal fissures heal within a few days to a few weeks. If a fissure persists beyond eight weeks, it’s considered chronic and typically needs more targeted treatment. The good news is that the vast majority of fissures, even chronic ones, do heal with the right approach.
How long yours lasts depends largely on what’s causing it, how you treat it, and whether certain underlying conditions are slowing things down. Here’s what to expect at each stage.
Acute Fissures: The First Eight Weeks
An acute anal fissure is a fresh tear in the lining of the anal canal. These are common, often triggered by passing a hard or large stool, and many heal on their own without any medical intervention. The tear is superficial, and the tissue has strong healing potential at this stage.
First-line treatment is simple: warm sitz baths, increased water intake, and a fiber supplement like psyllium to soften stools. These conservative measures resolve symptoms in close to half of patients with acute fissures that have been present for less than six weeks. For many people, the sharp pain during bowel movements begins to ease within the first week or two of consistent self-care, even before the fissure has fully closed.
The critical thing during this window is preventing re-injury. A fissure that keeps getting torn open by hard stools won’t heal, no matter how much time passes. Keeping stools soft and avoiding straining is more important than any medication at this stage.
When a Fissure Becomes Chronic
A fissure that hasn’t healed after eight weeks is classified as chronic. At this point, the tissue around the tear has often changed. You may notice a small skin tag near the fissure, or the edges of the tear may have thickened. The underlying muscle (the internal sphincter) tends to stay in spasm, which reduces blood flow to the area and makes healing harder. This creates a cycle: the spasm causes pain, the pain causes more spasm, and the reduced blood supply keeps the wound from closing.
Chronic fissures rarely heal with fiber and sitz baths alone. They typically require a prescription topical medication or a procedure to relax the sphincter muscle and restore blood flow to the tear.
Healing Times With Topical Medications
Two main types of prescription ointments are used for chronic fissures, and they work by relaxing the tight sphincter muscle.
Calcium channel blocker ointments (most commonly diltiazem) have the better track record. In systematic reviews covering hundreds of patients, about 78% to 82% of people using these ointments healed within roughly six weeks. That’s a strong result for a topical treatment.
Nitroglycerin ointment is the other option. It’s effective but slightly less so: about 63% of patients healed within eight weeks in clinical trials, compared to 38% with a placebo. The main downside is headaches, which are common enough that some people stop using it.
If your fissure hasn’t responded after a full course of topical treatment, that doesn’t mean you’re out of options. It does mean the next step is usually a procedure.
Botox Injections: 4 to 8 Weeks to Heal
Botox injected into the anal sphincter temporarily paralyzes the muscle, breaking the spasm cycle and allowing the fissure to heal. It’s an outpatient procedure, and recovery from the injection itself is quick.
The fissure typically takes 4 to 8 weeks to heal after the injection. Some people need a second round of injections a few months later to fully resolve the problem. Combining Botox with a topical medication appears to improve healing rates over either treatment alone.
One limitation: fissures can recur after Botox, sometimes years later, because the muscle eventually regains its full tone.
Surgical Recovery: About Six Weeks
A lateral internal sphincterotomy is the most effective treatment for chronic fissures, with healing rates of at least 88% that hold up for years. The procedure involves making a small, controlled cut in the internal sphincter muscle to permanently reduce its resting pressure.
Full healing of the surgical site takes about six weeks. Most people find that the severe pain resolves within a few days of the procedure, and the majority return to normal activities within one to two weeks depending on how physically demanding their routine is. Any short-term complications, like minor bleeding or discomfort, generally resolve within that same six-week window.
Surgery is typically reserved for fissures that haven’t responded to medications, though guidelines note it can be safely offered as a first-line option for chronic fissures in patients without certain risk factors. People with inflammatory bowel disease, prior obstetrical injuries, or previous anal surgeries may not be good candidates.
What Makes Fissures Take Longer to Heal
Several factors can significantly extend the timeline. The most important one is simply how long you’ve already had the fissure. Patients whose symptoms have lasted longer than one year are notably less likely to respond to medical therapy and more likely to need surgery.
Crohn’s disease is the biggest medical complicator. Fissures associated with Crohn’s are harder to heal across the board. The underlying inflammation impairs wound healing, and the usual treatments, including surgery, carry higher risks of complications. Patients with active rectal inflammation or frequent diarrhea may find that even sphincter-relaxing treatments like Botox are less effective.
Repeated re-injury is the other common culprit. Chronic constipation, frequent diarrhea, or habits that increase straining (like sitting on the toilet for long periods) can keep reopening a fissure that would otherwise heal. Addressing the underlying bowel pattern is often just as important as treating the fissure itself.
A Realistic Timeline to Expect
If your fissure is new, give conservative care a solid four to six weeks. Fiber, water, and sitz baths after bowel movements are the foundation. If you’re still having significant pain and bleeding after six to eight weeks, a topical prescription medication is the logical next step, with most people seeing results within another six to eight weeks.
For fissures that don’t respond to topical treatment, Botox or surgery can resolve the problem within roughly 4 to 8 weeks of the procedure. The entire journey from first symptom to full healing, if you need to step through each treatment tier, can stretch to several months. But most people don’t need to go through every stage. The majority of acute fissures heal with basic self-care, and the majority of chronic fissures heal with either a topical medication or a single procedure.