At a glance
For people considering LIS surgery, one of the most important questions is: what does life look like months and years later? This guide draws on what people describe about their long-term outcomes after lateral internal sphincterotomy — the good, the nuanced, and the realistic.
The short version: for the majority of people, LIS resolves the fissure, and the condition gradually stops being part of daily life. But the journey to that point has its own shape and timeline.
The timeline of healing
Months one to three: active recovery
This period is covered in detail in other guides. The key points: wound healing, gradual reduction in pain, adjustment to changes in sphincter function, and the emotional process of trusting that the improvement is real.
Months three to six: settling in
By this stage, most people describe:
- The wound has closed or is nearly closed
- Bowel movements are significantly less painful — often pain-free
- Any early continence changes (typically minor issues with gas control) are improving
- The anxiety about the fissure is reducing
- Daily life is returning to something close to pre-fissure normal
This period is characterised by quiet progress. The dramatic changes of early recovery give way to gradual normalisation.
Months six to twelve: the new normal
People at this stage describe something remarkable: forgetting about the fissure. After months or years of the condition dominating their thoughts, there are days — then weeks — where they simply do not think about it.
Common descriptions:
- Eating without calculation or fear
- Sitting through meetings, films, and meals without discomfort
- Travelling without anxiety about bathroom access
- Reduced or eliminated use of stool softeners
- A sense of having their life back
Beyond one year
People who check in at the one, two, or three year mark after LIS typically describe:
- The fissure is a memory. It shaped a significant period of their life but no longer affects daily decisions.
- Good habits persist. Many continue to eat well, stay hydrated, and maintain healthy bowel habits — not because they have to, but because the experience taught them the value of it.
- Gratitude and perspective. People commonly describe looking back with a mix of gratitude that the surgery worked and compassion for their past selves who lived with the pain for so long.
- Empathy for others. Many describe being more aware of and sympathetic to others dealing with colorectal conditions.
The nuances
Gas control
The most commonly discussed long-term change after LIS is some reduction in gas control. This is because the surgery involves a small, deliberate cut in the internal sphincter muscle. For most people, any early changes in gas control resolve within the first few months. A small number describe persistent, minor changes that they manage and consider a worthwhile trade-off.
The scar
LIS leaves a small scar that is not visible externally in most cases. Some people are aware of it; others never notice it.
Psychological recovery
The physical healing often outpaces the psychological recovery. People describe:
- Residual anxiety around bowel movements that fades slowly
- Hyperawareness of any sensation in the area — the body takes time to stop being on high alert
- Occasional fear of recurrence, particularly if they have a harder stool
- The gradual process of trusting their body again
This psychological adjustment is normal and does not require treatment for most people. It resolves naturally as time passes without recurrence.
Maintaining the outcome
People who describe the best long-term outcomes after LIS tend to maintain a few simple habits:
- Adequate fibre — not necessarily supplements, but a diet that includes fibre-rich foods
- Hydration — enough water to keep stools soft
- Responding to the urge — not delaying bowel movements
- Avoiding straining — good toilet posture, taking their time
- Managing stress — recognising the role of tension in gut function
These are not onerous requirements. They are basic habits that most people would benefit from regardless of their surgical history.
For those considering LIS
If you are reading this because you are considering LIS surgery and want to know what the long-term picture looks like: the overwhelming message from people who have been through it is positive. Not every story is perfect — some people have recurrence, some have persistent minor continence changes, some wish the recovery had been faster. But the majority describe LIS as the decision that finally ended their fissure and allowed them to move on with their life.
The journey to that point is not always easy. But the destination, for most, is worth it.