September 17, 2026 by Dr. Arun S. Nair

Most of us tend to ignore small changes in our bowel habits, thinking it’s just something we ate. But these changes are sometimes the body’s early way of telling us something isn’t right — colorectal cancer often develops silently until it reaches a later stage. By colon definition, it’s simply the last part of the digestive tract, and among the different types of colorectal carcinoma, colon adenocarcinoma (or adenocarcinoma of colon) is by far the most common.

The good news: caught early, it’s highly treatable, and knowing the early signs of colon cancer can change the outcome. If you’ve ever wondered what are symptoms of colon cancer, or searched for early symptoms late at night, this guide is for you — many people wait too long before speaking to a Gastroenterologist in Thrissur, simply not realising everyday symptoms could mean more.

That’s why Dr. Arun S. Nair, a Colorectal Surgeon in Thrissur at Elixir Clinic, put together this simple guide to the 7 warning signs of colorectal cancer you should never ignore.

One of the earliest and most common signs of colon cancer is a noticeable change in your bowel habits. This happens when a growing tumour partially blocks the colon and interferes with its normal movement. Watch out for:

Diarrhoea, constipation, or a change in stool consistency lasting more than a few days
Narrower, almost ribbon-shaped stools
Pebble-like or floating stools
Pain localised to the sigmoid colon or caecum region, pointing to an underlying colonic disease

If your bowel habits stay different for more than 2-3 weeks with no dietary reason, it’s worth getting checked rather than assuming it’s just an upset stomach.

Seeing blood in your stool can be alarming, and rightly so — it’s one of the most commonly searched rectal cancer symptoms. The blood may show up as:

Bright red streaks, usually from bleeding closer to the rectum
Darker blood mixed within the stool, which is harder to notice and often overlooked

Many people mistake this for piles or a minor fissure and delay seeing a doctor. While bleeding piles are far more common, only a proper examination can tell the two apart — a quick check with a Colorectal Surgeon in Thrissur can confirm the exact cause and rule out anything serious. If the bleeding continues for more than a few days, don’t self-diagnose — get it evaluated.

Ongoing cramps, gas, bloating, or a dull pain in the abdomen that doesn’t ease with the usual remedies can also be an early symptom. This discomfort often happens because a growing tumour affects the normal movement of the colon. It’s easy to link this to indigestion or gas trouble, but if the pain keeps returning or worsens over weeks, it needs proper attention from a Gastroenterologist in Thrissur rather than repeated antacid use.

A sensation that your bowels haven’t fully emptied, even right after using the washroom, is another sign worth noting. This happens because a tumour, even a small one, can create a feeling of blockage or pressure in the rectum. If this feeling shows up regularly rather than once in a while, it shouldn’t be brushed aside as “just how things are.”

Losing weight without trying — with no change in diet or exercise — is a red flag for several health conditions, including colorectal cancer. This can happen because:

Cancer cells use up the body’s energy faster than normal
Digestive changes caused by a tumour can affect appetite and nutrient absorption

If you’ve lost a noticeable amount of weight over a short period without explanation, it’s important to rule out serious causes.

Constant tiredness that doesn’t improve with rest can also be linked to colorectal cancer, usually because of chronic, slow blood loss that a person may not even notice. This ongoing fatigue is often dismissed as work stress or poor sleep, but if it persists alongside any of the other signs mentioned above, it’s best to get a check-up done.

Sometimes, colorectal cancer is picked up first not through a visible symptom, but through a routine blood test showing low iron levels. Iron-deficiency anemia in adults — especially in men and postmenopausal women — without an obvious cause should always be investigated further, since chronic internal bleeding from the colon can be a hidden reason behind it. Catching this early also opens up far more options for Colon Cancer Treatment in Thrissur, right from the diagnosis stage.

While anyone can develop colorectal cancer, certain factors raise the risk:

Age above 45-50
Family history of colon cancer, or a personal history of colon polyps symptoms such as bleeding or altered bowel habits
Personal history of inflammatory bowel disease
Diet low in fibre and high in processed food
Smoking and regular alcohol use
A sedentary lifestyle with little to no physical activity

What causes colon cancer in females and males is largely similar — diet, genetics, and lifestyle — though hormonal factors and family history can play an additional role in women. If several of these risk factors apply to you, it’s worth booking a consultation with a Gastroenterologist in Thrissur for a proper risk assessment, rather than waiting for symptoms to show up.

If any of these signs of colon cancer last for more than two to three weeks, don’t wait it out. Early consultation can help identify the exact cause through simple tests like a colonoscopy or blood work, before there’s any chance of the disease progressing towards intestinal cancer metastasis.

It’s also worth remembering:

There’s no single sign that guarantees a clean bill of health — normal reports today don’t rule out risk in the future
Periodic screening still matters for high-risk individuals, even without symptoms
Routine screening is generally recommended from age 45 onwards, or earlier if you have a family history, since early-stage colorectal cancer often has very mild symptoms, or none at all

Dr. Arun S. Nair and his team at Elixir Clinic focus on accurate, timely diagnosis and dependable Colon Cancer Treatment in Thrissur, so patients get a clear treatment plan without unnecessary delay.

Colorectal cancer doesn’t always announce itself loudly — often, it’s the small, persistent changes in your body that matter the most. Paying attention to these 7 warning signs and acting on them early can make a real difference in outcomes.

With over 16 years of experience, Dr. Arun S. Nair has helped countless patients catch colorectal cancer early and get the right care in time. If you or a loved one is experiencing any of these symptoms, don’t delay — book a consultation with this trusted Colorectal Surgeon in Thrissur at Elixir Clinic for a thorough evaluation and dependable Colon Cancer Treatment in Thrissur.

👉 How do you know if you have colon cancer?

It can’t be confirmed just by guessing — it needs a colonoscopy, blood work, or imaging. But persistent bowel changes, blood in stool, or unexplained weight loss lasting over 2-3 weeks are strong enough reasons to get examined.

👉 Is colon cancer curable?

Yes, and survival rates are genuinely encouraging when caught early. Stage 1 colon cancer symptoms are often mild, which is exactly why routine screening matters so much.

👉 What are the symptoms of colon pain?

Usually cramping, bloating, or a dull, ongoing ache. Depending on the area affected, it may show up as sigmoid colon pain on the left side or caecum pain on the right.

👉 What are the final symptoms of stage 4 colon cancer?

Severe fatigue, rapid weight loss, and persistent abdominal pain, often along with signs of the cancer spreading to other organs. This is exactly why catching warning signs early makes such a big difference.

👉 What is good for colon cancer prevention?

A fibre-rich diet, regular activity, and avoiding smoking or excess alcohol all help lower long-term risk. Routine screening from age 45 onward, or earlier with a family history, catches far more cases early.

👉 What causes colon cancer?

Colon cancer causes are rarely down to one factor — usually a build-up of age, family history, diet, and lifestyle habits like smoking or inactivity. Genetics can also play a role in some cases.

👉 What happens if colon cancer is left untreated?

It tends to progress steadily and can spread to other organs, making treatment considerably more complex. This is precisely why early diagnosis keeps more treatment options open.

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1. Changes in Bowel Habits:

2. Rectal Bleeding or Blood in Stool:

3. Persistent Abdominal Discomfort:

4. Feeling of Incomplete Bowel Emptying:

5. Unexplained Weight Loss:

6. Weakness or Fatigue:

7. Unexplained Iron-Deficiency Anemia:

Risk Factors to Be Aware Of:

When to See a Doctor?

Conclusion:

Frequently Asked Questions:

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