Colorectal Cancer: What You Need to Know About the "Silent" Cancer Quietly Rising in India

At A Glance

You've been ignoring that nagging change in your bowel habits for months. A little blood in the stool. Some cramping that comes and goes. "Probably just piles," you tell yourself. "Maybe I ate something wrong." Colorectal cancer — cancer of the colon and rectum — is a disease that speaks in whispers before it roars. It is the third most common cancer globally, and its incidence in India is rising, particularly among younger adults. This article walks you through the global and Indian epidemiology of colorectal cancer, its established risk factors, and what you can do today to protect yourself and your family.

What Is Colorectal Cancer?

Colorectal cancer (CRC) refers to cancers that arise in the colon (large intestine) or the rectum. Together, they form a single disease category because of their shared anatomy, biology, and risk factors. Most colorectal cancers develop slowly — over a period of 10 to 20 years — beginning as small, non-cancerous growths called polyps on the inner wall of the colon or rectum. That long developmental window is the most important fact you need to understand: it means this cancer is preventable and detectable long before it becomes dangerous.

The Global Picture: A Disease You Cannot Afford to Ignore

Colorectal cancer is one of the most common and lethal cancers in the world. According to GLOBOCAN 2022 data published by the International Agency for Research on Cancer (IARC), over 1.9 million new cases of CRC occurred globally in 2022, with nearly 900,000 deaths attributed to it. It ranks as the third most commonly diagnosed cancer worldwide and the second most common cause of cancer-related death globally — a figure confirmed by multiple peer-reviewed publications including a 2024 review published in Cancers (MDPI) and a 2025 article published in Digestion (Karger).

The burden of CRC is not evenly distributed. Geographically, the highest incidence rates are found in Australia, New Zealand, Europe, and North America, while the lowest rates are reported in South-Central Asia and Sub-Saharan Africa. However, these low-incidence regions — India included — are seeing a troubling upward trend.

The India Story: Rising Rates in a "Low-Incidence" Country

India has traditionally been considered a low-incidence country for colorectal cancer. But the term "low incidence" should not be confused with "no risk." According to GLOBOCAN 2022 data, India recorded 64,863 new cases of colorectal cancer and 38,367 deaths in a single year, making it the fourth most common cancer in both sexes in India. The incidence is higher in men than in women, and urban populations face a markedly greater burden than rural ones.

Perhaps more worryingly, a study published in the Journal of Clinical Oncology reviewing data from India's National Cancer Registry Program between 2004 and 2014 found that CRC incidence rates in India rose by 20% over that decade. A comprehensive 2025 review published in the Indian Journal of Gastroenterology confirms this rising trend, particularly among younger Indians, and particularly in urban centres.

Here is the uncomfortable reality: India's CRC profile differs from that of Western countries in a critical way. Indian patients tend to present at a younger age and at a more advanced stage. Research from major cancer centres in India consistently shows that a significant proportion of Indian CRC patients are under 40 years of age at diagnosis — a pattern strongly linked to delayed presentation and inadequate early detection. Put simply, Indian patients are arriving too late and too young.

Why Is Colorectal Cancer Rising in India?

The rise in CRC incidence in India mirrors changes in lifestyle and diet, particularly in urban India. The shift away from traditional high-fibre, vegetable-rich Indian diets toward processed foods, red meat, and sedentary lifestyles is driving a measurable increase in cases. Research published in the Indian Journal of Gastroenterology (2025) identifies the following modifiable contributors specific to the Indian context:

Increased consumption of red and processed meat, fried foods, and sugary beverages is a primary driver. Growing rates of overweight and obesity, especially in cities, are contributing to a higher baseline risk. Physical inactivity — now a defining characteristic of urban Indian working life — independently raises CRC risk. Rising rates of type 2 diabetes, itself an established independent risk factor for CRC, add further to the burden. Tobacco and alcohol consumption, both well-established risk factors for colorectal cancer, remain prevalent across many Indian demographics.

Additionally, dietary patterns in specific Indian regions play a role. Higher incidence rates in India's Northeast and Southern regions have been linked, in part, to greater consumption of red meat, beef, and pungent spices in local diets, according to studies from India's National Cancer Registry Program.

The Established Risk Factors for Colorectal Cancer

Medical science has clearly identified the risk factors for CRC. These fall into two categories: modifiable — things you can change — and non-modifiable — things you cannot change but must be aware of.

Modifiable Risk Factors

The first and most impactful modifiable risk factor is diet. Diets high in red meat — particularly processed meats like sausages, ham, and packaged cold cuts — are consistently associated with increased CRC risk across multiple large studies. A diet low in dietary fibre is similarly well-established as a contributing factor. Whole grains, legumes, vegetables, and fruits are protective.

Physical inactivity is independently associated with higher CRC risk. Regular physical activity has been shown to reduce CRC risk through multiple mechanisms, including its effect on gut transit time, insulin sensitivity, and body weight.

Overweight and obesity are recognised risk factors, with excess adipose tissue promoting chronic low-grade inflammation that can accelerate tumour development.

Alcohol consumption is associated with increased CRC risk in a dose-dependent manner — meaning the more you drink, the greater the risk. Long-term tobacco smoking is also an established risk factor.

Type 2 diabetes and insulin resistance create a hormonal environment that promotes colorectal tumour growth.

A 2024 peer-reviewed review in Cancers (MDPI) also identifies high-fructose corn syrup (HFCS) consumption as a potential risk factor. An experimental study found that regular intake of sugary drinks containing HFCS was linked to accelerated polyp development in pre-clinical models — a finding of direct relevance given the rapid increase in soft drink consumption in Indian cities.

Inflammatory bowel disease (IBD) — specifically ulcerative colitis and Crohn's disease — significantly increases CRC risk, particularly when these conditions are long-standing and incompletely controlled.

Non-Modifiable Risk Factors

Age is the most powerful non-modifiable risk factor. The median age at diagnosis globally is around 66 years, and the risk rises sharply after 50. However, incidence rates in younger adults — those under 50 — have been increasing steadily since the mid-1980s in the United States, and similar early-onset trends are being documented in India.

A personal or family history of colorectal cancer or adenomatous polyps is a significant risk factor. If a first-degree relative — parent, sibling, or child — has had CRC or advanced polyps, your risk is meaningfully elevated, and you should discuss earlier screening with your doctor.

Hereditary genetic syndromes account for a minority of cases but carry very high lifetime risk. Lynch syndrome (also called Hereditary Non-Polyposis Colorectal Cancer or HNPCC) and Familial Adenomatous Polyposis (FAP) are the two most important. Research indicates that nearly 30% of colorectal cancer cases in individuals under 50 can be attributed to family history or genetic predisposition.

Previous radiation therapy to the abdomen or pelvis for a prior cancer also increases CRC risk.

Sound Familiar? The Warning Signs You May Be Explaining Away

Colorectal cancer is often called a "silent" cancer because early-stage disease may produce no symptoms at all. When symptoms do appear, they are frequently attributed to more common and less serious conditions — a pattern that delays diagnosis, sometimes with serious consequences.

Here are the symptoms that deserve prompt medical evaluation: a persistent change in bowel habits — including diarrhoea, constipation, or a change in stool consistency lasting more than a few weeks; blood in or on the stool, which can appear bright red or very dark; persistent abdominal discomfort such as cramps, gas, or pain; a feeling that your bowel doesn't empty completely; unexplained fatigue; and unexplained weight loss.

"It's just haemorrhoids." This is the single most common explanation that Indian patients give when they notice rectal bleeding — and one that delays diagnosis more than any other. The truth is this: you cannot determine the cause of rectal bleeding by self-examination. Only a qualified medical professional with appropriate diagnostic tools can make that determination. Haemorrhoids and colorectal cancer can coexist. Dismissing one does not rule out the other.

A Real Story Worth Reading

Sandeep, 42, a software manager from Bengaluru, noticed blood in his stool on and off for eight months. He was fit, active, and had no family history of cancer. He assumed it was related to his occasional haemorrhoids. When he finally saw a gastroenterologist — prompted by his wife's persistent urging — a colonoscopy revealed a moderately differentiated adenocarcinoma in the sigmoid colon. The cancer was Stage II. He required surgery followed by adjuvant chemotherapy. His surgeon was direct: had he come six months earlier when symptoms first appeared, the polyp might still have been at a pre-cancerous stage.

Sandeep's story is not unusual. It reflects a pattern well-documented in Indian oncology literature: young, otherwise-healthy patients presenting with symptoms for months before seeking care, and finding cancer at a more advanced stage than necessary.

What Your Brain Is Telling You vs. What the Evidence Says

"I'm too young for colon cancer." The evidence does not support this reassurance. Multiple studies from India's cancer registries document a higher proportion of young-onset CRC cases — under 40 — in India compared to Western populations. Young-onset CRC in India is often more aggressive and more frequently presents at an advanced stage.

"It's probably piles." Haemorrhoids are common. So is colorectal cancer. One does not exclude the other. Any persistent rectal bleeding warrants professional evaluation.

"I eat well and exercise." While a healthy diet and active lifestyle are genuinely protective, they do not eliminate risk entirely. Non-modifiable factors like genetic predisposition, age, and IBD-related risk exist independently of lifestyle choices.

"It doesn't run in my family." Only a fraction of CRC cases are hereditary. The majority are sporadic — meaning they arise in people with no family history at all. Sporadic CRC is driven primarily by lifestyle and environmental factors.

"I'll wait until I feel really unwell." This approach is medically dangerous. Early-stage colorectal cancer is often entirely asymptomatic. Waiting for severe symptoms means waiting for advanced disease.

Protective Factors: What the Evidence Supports

The same research that identifies risk factors points to clear protective factors. A diet rich in vegetables, fruits, whole grains, legumes, and dairy products is consistently associated with lower CRC risk across multiple population studies. Adequate calcium and folate intake appear protective. Regular physical activity reduces risk. Maintaining a healthy body weight matters.

The traditional Indian diet — rich in legumes (dal), vegetables, whole grains, and curd — is inherently protective. The problem is that this dietary pattern is being abandoned in urban India precisely as CRC rates rise. Returning to it is one of the most meaningful things an Indian family can do to reduce their long-term colorectal cancer risk.

Interestingly, two pharmacological agents have been associated with reduced CRC risk in research: aspirin, in appropriate clinical doses and only with medical guidance, and metformin, used in the management of diabetes. These findings come from multiple epidemiological studies and are not recommendations for self-medication — any consideration of these agents must be discussed with a qualified physician.

Screening: The Most Powerful Tool You Are Not Using

The American Cancer Society (ACS) recommends that people at average risk begin colorectal cancer screening at age 45. This recommendation was updated in 2018 from the previous starting age of 50, reflecting the growing evidence of rising CRC incidence in younger adults. The 2025 ACS guidelines maintain this age 45 threshold, supported by modelling studies demonstrating that the benefits of screening outweigh harms in this age group.

Available screening options include colonoscopy — the gold standard, recommended every 10 years for average-risk individuals with negative findings — stool-based tests including faecal immunochemical testing (FIT, annually) and multi-target stool DNA testing (every one to three years), CT colonography, and flexible sigmoidoscopy.

For people at elevated risk — those with a first-degree relative diagnosed with CRC before age 60, or with a personal or family history of advanced polyps — current guidelines from the US Multi-Society Task Force recommend beginning colonoscopy at age 40, or 10 years before the youngest affected family member's diagnosis, whichever comes first.

For those with hereditary syndromes like Lynch syndrome or FAP, screening should begin in the teenage years and be managed by a specialist with expertise in these conditions.

In India, population-wide mass screening is currently not recommended because of resource constraints. However, targeted screening for high-risk individuals — those with family history, IBD, prior polyps, or hereditary syndromes — is clinically appropriate and should be actively pursued. Given the higher proportion of younger Indian patients presenting with advanced disease, any Indian adult over 40 with bowel symptoms, a family history of CRC, or known IBD should discuss screening with their physician without delay.

What You Must Do in the Next Few Weeks

Assess your risk profile honestly. Do you have a family history of colorectal cancer or polyps? Have you been diagnosed with IBD, diabetes, or obesity? Are you over 45? Have you noticed any bowel changes, rectal bleeding, or unexplained fatigue? These questions deserve honest answers and, if the answer to any of them is yes, a direct conversation with your doctor.

Have a frank discussion with your gastroenterologist or general physician about screening. Ask specifically about colonoscopy or, if colonoscopy is not immediately accessible in your area, about stool-based testing options.

Do not dismiss rectal bleeding. Do not attribute it to haemorrhoids without professional evaluation. Do not delay.

If you have a family history of CRC or are experiencing symptoms, do not wait. Early-stage CRC, detected when confined to the bowel wall, is highly treatable. Late-stage CRC — once it has spread to regional lymph nodes or distant organs — carries a far more difficult treatment journey and a less certain outcome.

Every week matters.

Professional Support Options

If you're experiencing possible colorectal cancer symptoms, seeking a second opinion on a diagnosis, or unsure which diagnostic tests or treatment options are right for you, don't wait. Speak with a qualified oncologist today.

Connect with experienced U.S.-based cancer specialists for a comprehensive second-opinion consultation. They will carefully review your case and help determine the most appropriate next steps for your individual health needs:

👉 https://myamericandoctor.com/our-doctors/

You may also choose to enroll in our upcoming concierge medical clinic in India, Global Concierge Doctors. We offer U.S.-style primary care with 24/7 access to India-based physicians for ongoing guidance on any health concern. When required, we coordinate referrals to trusted specialists in India and the U.S. for advanced evaluation and care.

Your health decisions today shape your life tomorrow.

Reader Poll

Have you ever ignored bowel symptoms or blood in the stool for more than a few weeks?

• Yes, and I'm going to book a doctor's appointment this week
• Yes, but I've been putting it off
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