Most people notice that the sharp, burning pain from their anal fissure starts to fade within a few days of surgery. Full healing takes about six weeks, but the worst of recovery is typically behind you within the first one to two weeks. The most common procedure for chronic anal fissures, lateral internal sphincterotomy, has a 95% success rate in curing them permanently, so the odds are strongly in your favor.
The First Few Days
The surgery itself is quick and usually done as an outpatient procedure, meaning you go home the same day. You’ll feel sore in the area, but postoperative pain is generally mild. Studies measuring pain after sphincterotomy consistently find that most patients rate their discomfort around a 2 out of 10, which is a dramatic improvement over the pain that brought them to surgery in the first place.
Some swelling and tenderness around the surgical site is normal. You may also notice light bleeding on toilet paper when you have a bowel movement. This spotting is expected and can continue for the first few weeks. Sitting on a donut-shaped cushion or pillow can help take pressure off the area during these early days.
Managing Bowel Movements
Your first bowel movement after surgery is the part most people dread, and there’s no sugarcoating it: it can be uncomfortable. The key is keeping your stool soft so you’re not straining. Pain medication, which you’ll likely be taking in the first few days, causes constipation, so you need to actively work against that.
Take a stool softener the entire time you’re on pain medication. A fiber supplement also helps, and you should aim for 25 to 35 grams of fiber daily through a combination of supplements and food. Drink at least six to eight glasses of water or other non-caffeinated beverages each day. Every time you take a fiber supplement dose, have at least two extra glasses of water with it.
If two days pass without a bowel movement, a mild laxative like milk of magnesia can get things moving. If three days pass with no results, a stronger stimulant laxative is the next step. Going beyond three days without a bowel movement warrants a call to your surgeon.
Recovery Timeline: Week by Week
During the first week, expect to spend most of your time resting at home. Soreness after bowel movements, mild bleeding, and general tenderness are all normal. Warm sitz baths (sitting in a few inches of warm water) several times a day, especially after bowel movements, help with both pain and keeping the area clean.
By weeks one to two, most people feel well enough to return to work and resume their normal routine. If you have a desk job or other sedentary work, the earlier end of that range is realistic. If your job involves physical labor, plan for a longer timeline.
For heavy manual work, including significant lifting, most surgeons recommend waiting a full six weeks before returning to full duties. This is also the general timeframe for complete healing of the surgical site. By the six-week mark, the tissue has fully repaired and you can expect to resume all activities without restriction.
What to Eat During Recovery
Diet matters more during this recovery than you might expect. Hard or bulky stools put strain on the healing area, so your goal is to keep everything moving through smoothly. High-fiber foods like fruits, vegetables, whole grains, and legumes form the foundation. If you weren’t eating much fiber before surgery, increase your intake gradually to avoid bloating and gas.
Staying hydrated is equally important. Fiber works by absorbing water, and without enough fluid, it can actually make constipation worse. Six to eight glasses of water daily is the minimum. Avoid foods that tend to cause constipation or irritation: processed foods, excessive dairy, alcohol, and spicy foods are worth limiting in the early weeks.
Gas and Bowel Control Changes
Because the surgery involves making a small cut in the muscle that controls your anal sphincter, temporary changes in bowel control are relatively common. As many as 39% of patients experience some degree of transient incontinence after the procedure, though this sounds more alarming than it usually is in practice.
The most common issue is difficulty controlling gas, which affects roughly 1 in 4 patients. A small number of people (about 2%) experience difficulty controlling liquid stool. No patients in long-term follow-up studies reported losing control of solid stool. For most people, these symptoms resolve within six to eight weeks as the muscle heals and adapts.
Long-term incontinence after this surgery is rare and, when it does occur, is typically mild enough that it doesn’t affect quality of life. This is one reason surgeons are careful about how much of the muscle they cut, balancing fissure healing against preserving continence.
Signs That Something Needs Attention
Light bleeding on toilet paper after bowel movements is normal for the first few weeks. What isn’t normal is heavy bleeding that soaks through a pad, a fever, increasing pain that gets worse rather than better over time, or significant swelling that develops days after surgery. Pus or foul-smelling drainage from the wound can signal an infection. Any of these warrant contacting your surgeon promptly.
Long-Term Outlook
Lateral internal sphincterotomy has been performed for decades and remains the gold standard for chronic anal fissures that haven’t responded to other treatments. The 95% cure rate means the vast majority of people who have this surgery never deal with that particular fissure again. Long-term complications occur in fewer than 5% of cases.
Recurrence is possible but rare. Maintaining a high-fiber diet and staying well-hydrated after you’ve fully healed are the best ways to prevent new fissures from forming. These habits keep stool soft and reduce the straining that causes fissures in the first place.