At a glance
Leakage and soiling after anal surgery is one of the most common — and most under-discussed — concerns people have. It is the thing many people worry about before surgery, and the thing they are most reluctant to talk about if it happens afterwards.
This guide covers what is normal in the early weeks, the difference between temporary adjustment and lasting change, the spectrum from mucus discharge to frank incontinence, and what you can do about it. It applies primarily to surgeries that involve the sphincter muscle — particularly LIS (lateral internal sphincterotomy) — but the principles are relevant after other anal procedures too.
The most important thing to know upfront: some degree of leakage in the early weeks is common and does not necessarily mean something has gone wrong.
What “leakage” actually means
The word leakage covers a wide range of experiences, and the distinctions matter. People use the same word to describe very different things:
Mucus discharge
In the first few weeks after surgery, many people notice mucus on underwear or when wiping. This is typically related to the healing wound rather than a sphincter problem. The surgical site produces discharge as it heals — this is expected.
Minor soiling
Small amounts of staining on underwear, particularly after passing gas or during physical activity. This is one of the most commonly reported experiences in the early weeks after LIS. For most people, it settles as the sphincter adjusts.
Seepage
Some people describe a sensation of moisture around the anus that they did not have before surgery. This can be related to changes in sphincter tone, the wound healing process, or both. It is typically low-volume and manageable with hygiene measures, but it can be psychologically distressing.
Urgency
Needing to reach the toilet more quickly than before. The sensation of “I need to go now” rather than being able to wait comfortably. This is related to the reduced sphincter tone and is one of the changes that tends to improve over time.
Gas control changes
Difficulty holding gas, gas passing without warning, or being less able to distinguish between gas and stool. This is the most frequently reported continence change after LIS. For many people it is temporary. For some, a mild change persists but is considered manageable.
Frank incontinence
Involuntary loss of formed stool. This is rare after standard LIS and is very different from the soiling and seepage that most people describe. If this is happening, it needs prompt discussion with your surgical team.
The timeline: what people describe
First two weeks
The early days are the most variable. People report:
- Mucus discharge from the healing wound — this is normal wound healing
- Difficulty controlling gas — very common
- Minor soiling, particularly after bowel movements or sitz baths
- Anxiety about every sensation, making it hard to tell what is “real” leakage versus heightened awareness
At this stage, it is difficult to separate wound-related discharge from sphincter-related changes. Most of what people experience in the first two weeks is a combination of both.
Weeks two to six
This is the period where wound discharge typically begins to settle and sphincter adjustment becomes clearer. People commonly describe:
- Mucus discharge reducing
- Gas control gradually improving
- Minor soiling becoming less frequent
- Beginning to develop a sense of how things are trending — improving, stable, or concerning
One to three months
By this point, wound healing is well established and any continence changes are more clearly related to the sphincter. Most people who had early leakage describe significant improvement by this stage. The body adapts to the slightly reduced sphincter tone.
Three to six months and beyond
The majority of temporary changes have resolved or significantly improved. If changes persist at this point, they are more likely to represent a longer-term adjustment. This does not necessarily mean permanent — some people describe continued gradual improvement over a year or more — but it is the point where most doctors will discuss active management strategies.
Why leakage happens after sphincter surgery
Understanding the mechanism helps make sense of the experience.
The internal anal sphincter is responsible for around 70 to 80 percent of resting anal tone — the baseline pressure that keeps the anal canal closed at rest. During LIS, a small portion of this muscle is cut. The result is a permanent, deliberate reduction in resting pressure.
This reduced pressure is what allows the fissure to heal — it reduces the spasm that was restricting blood flow. But it also means the muscle is doing slightly less work than before. For most people, the remaining muscle and the external sphincter compensate adequately. For some, there is a period of adjustment. For a small number, the compensation is incomplete.
Factors that affect how much leakage someone experiences include:
- The length of the sphincterotomy. A longer cut reduces pressure more. Surgical technique matters.
- Pre-existing sphincter strength. People who already had some sphincter weakness — from previous surgery, childbirth, or age — have less reserve to compensate.
- Stool consistency. Loose stools are much harder to control than formed stools. Managing stool consistency is one of the most effective interventions.
- Pelvic floor strength. The external sphincter and pelvic floor muscles can compensate for reduced internal sphincter tone, but only if they are functioning well.
What you can do about it
In the early weeks
- Wear a light pad or liner. There is no shame in this. Many people find it reduces anxiety and lets them focus on recovery rather than worrying about their underwear.
- Keep the area clean and dry. Gentle cleansing after bowel movements, patting dry, and avoiding irritating products.
- Manage stool consistency. Continue with stool softeners as prescribed. Soft, formed stools are easier to control than loose stools.
- Give it time. The hardest advice, but the most consistently validated. The majority of early leakage improves.
If leakage persists beyond six to eight weeks
- Talk to your surgeon. Report what you are experiencing in specific terms — mucus, soiling, gas, urgency, or stool. The more precise you can be, the more helpful the conversation.
- Ask about pelvic floor physiotherapy. A specialist can assess your pelvic floor function and design a targeted exercise programme. Many people find this makes a meaningful difference.
- Review your diet. Foods that cause loose stools or gas can worsen leakage. Keeping a food diary may help identify triggers.
- Consider fibre adjustment. Bulking the stool with fibre can improve control for some people, though the right amount varies.
Pelvic floor exercises
Pelvic floor exercises — sometimes called Kegel exercises — strengthen the muscles that support bowel control. After anal surgery, these muscles may need to work harder to compensate for the reduced sphincter tone.
Key points:
- Ideally, get guidance from a pelvic floor physiotherapist rather than relying on general instructions. Technique matters.
- Consistency matters more than intensity. Short, regular sessions are more effective than occasional long ones.
- It takes weeks to months to see results. This is muscle strengthening, and muscles do not change overnight.
- Some people find biofeedback — where a device helps you see whether you are engaging the right muscles — particularly helpful.
The emotional weight
Leakage after surgery carries an emotional burden that is disproportionate to the physical reality. People describe:
- Shame and embarrassment, even when the leakage is objectively minor
- Regret about having the surgery, particularly in the early weeks before improvement is clear
- Anxiety about social situations, work, and being away from a toilet
- Difficulty talking about it — even with their doctor, even with their partner
If you are experiencing this, you are not alone. These feelings are common and understandable. The embarrassment of leakage is real, even when the actual volume is small. It touches on something fundamental about dignity and control.
Two things are worth remembering:
First, most post-surgical leakage improves. The weeks immediately after surgery are not a reliable predictor of your long-term outcome.
Second, your surgeon has had this conversation many times. They are not surprised. They are not judging. They need to know what you are experiencing in order to help.
When to contact your doctor
Seek medical attention if you experience:
- Complete loss of bowel control — involuntary loss of formed stool
- Significant worsening of leakage, particularly if it was improving and then deteriorated
- Fever or signs of infection
- Blood in discharge that is new or increasing
- Leakage that is affecting your daily life and not improving after six to eight weeks — this is not an emergency, but it warrants a conversation about management options
If you are not sure whether what you are experiencing is normal, ask. Your surgical team would rather answer your question than have you suffer in silence.