You have finished treatment for colorectal cancer. That is a big milestone. But now your bowels do not feel the way they used to. Trips to the toilet are more frequent, more urgent, or just unpredictable. If this sounds familiar, you are not alone, and there are practical ways to feel more in control.

The short version: Bowel changes are very common after surgery for colon or rectal cancer. For many people, the worst settles within a few weeks to a year. Small changes to what you eat, when you eat, and a few daily habits can ease symptoms. This article explains what to expect, what may help, and the signs that mean you should call your care team.

Why your bowels change after surgery

Your large bowel (colon) does an important job. It absorbs water from waste before you pass a stool. When a surgeon removes part of the colon or rectum, the bowel has less room and less time to do this. So stools can become looser, more frequent, and harder to predict (Source: Cancer Research UK, 2024).

How long this lasts often depends on the type of surgery. After surgery on the colon, stools may be looser and more frequent at first, but this usually settles down after a few weeks. After surgery on the rectum, bowel problems can last several weeks, and for many people they continue for around a year. Things often keep improving slowly, even if they do not return exactly to how they were before (Source: Cancer Research UK, 2024).

Common changes people notice include:

• Going to the toilet more often than before

• Loose stools, or sometimes harder stools

• A sudden or constant urge to go

• Trouble fully emptying your bowel

• Leaking or loss of bowel control

• Bloating, wind, and gas

• Sore or irritated skin around the back passage

What is low anterior resection syndrome (LARS)?

Some people who have surgery for rectal cancer develop a longer-term pattern of symptoms called low anterior resection syndrome, or LARS. This is a group of bowel problems, mainly going very often and with little warning (Source: Cancer Research UK, 2024).

LARS can affect daily life, work, and confidence. The good news is that symptoms often become less severe with time, and there are treatments and support to help you manage them. If you think you have LARS, tell your care team. They can suggest a plan and may refer you to a specialist.

Eating to settle your bowels

Food has a big effect on how your bowels behave after surgery. There is no single "right" diet, and what bothers one person may be fine for another. The aim is to find what works for your body, often with help from a dietitian.

Fibre: go slow

Right after surgery, many people are advised to follow a lower-fibre diet for about six weeks. This can mean foods like white bread and pasta, plain crackers, and cornflakes. After that, you slowly add more fibre back as your body tolerates it (Source: Cancer Research UK, 2024). Adding fibre too fast can cause wind and loose stools, so small steps work best.

Foods that often cause wind

Some foods are more likely to cause gas, bloating, or loose stools while you recover. Common ones include onions, brussels sprouts, and cabbage, beans and lentils, fizzy drinks, and very rich or fatty foods (Source: Cancer Research UK, 2024). You do not have to avoid these forever. Many people add them back later in small amounts.

Eat small, eat often

Large meals can overwhelm a healing bowel. Eating smaller meals more often, and trying not to leave long gaps between them, can feel gentler. While you are healing, foods higher in calories and protein can also support recovery.

Drink enough fluids

Loose stools and diarrhoea can leave you short of fluid. Aim to drink plenty through the day, roughly 1.5 to 2 litres, unless your team has told you otherwise (Source: Cancer Research UK, 2024). If diarrhoea is heavy or lasts, your team may suggest rehydration drinks to replace lost salts.

Daily habits that can help

Beyond food, a few simple habits can make day-to-day life easier:

• Keep a food and symptom diary. Write down what you eat, when, and how your bowels respond. Over a week or two, patterns appear, and this is very useful information for a dietitian.

• Try pelvic floor exercises. These exercises help strengthen the muscles that control the back passage, which may reduce urgency and leaking. Ask your care team how to do them correctly.

• Build a loose routine. Eating at similar times each day can make bowel habits a little more predictable.

• Plan ahead when going out. Knowing where toilets are can lower anxiety and help you feel free to leave the house.

Staying gently active also matters for long-term health. Research suggests that people who get regular physical activity after treatment have a lower risk of colorectal cancer coming back, and diets rich in vegetables, fruit, whole grains, chicken, and fish are linked with better outcomes (Source: American Cancer Society, 2024). Building these habits is part of a wider set of healthy lifestyle choices that can lower cancer risk. Start small and build up at a pace that suits you.

Your follow-up care and recurrence checks

Life after treatment includes regular check-ups. These visits track your recovery and look for any sign that the cancer has come back. They are also a chance to raise bowel problems that are not improving.

Schedules vary by person, but as a general guide, doctors often recommend exams and tests every 3 to 6 months for the first couple of years, then about every 6 months for the next few years. A colonoscopy is usually done about a year after surgery, and if it is normal, the next one may not be needed for around 3 years (Source: American Cancer Society, 2024).

Your team may also use blood tests, including a tumour marker called CEA, and scans to watch for recurrence. If a CEA level rises, it can be an early prompt for more checks (Source: American Cancer Society, 2024). Knowing the plan can make follow-up feel less stressful. Many of the same daily habits that aid recovery overlap with broader steps explained in this guide to how lifestyle choices affect cancer risk.

The emotional side of bowel changes

Bowel changes are not just physical. Worrying about leaks, urgency, or finding a toilet can affect mood, sleep, and confidence. Some people pull back from social events or work because they feel unsure of their body.

These feelings are common and valid. Talking to your care team, a counsellor, or others who have been through similar surgery can help. Support groups, in person or online, let you swap practical tips and feel less alone. If low mood or anxiety lasts more than a couple of weeks, tell your doctor.

You know your body best. If something feels wrong or worrying between appointments, do not wait for your next scheduled visit, reach out to your team.

This article is for general information and is not a substitute for medical advice. Always consult your oncologist or care team about your specific situation.