Not all cancers show warning signs early: Doctors explain why ignoring mild symptoms can be dangerous

Cancer is often imagined as a disease that arrives with dramatic warning signs. Severe pain, sudden weakness, or visible lumps are usually what people expect. But doctors say reality is often far quieter. Many cancers begin with symptoms so small and ordinary that they are mistaken for acidity, fatigue, stress, ageing, or digestion problems. By the time the disease starts “shouting,” it may already have progressed.

That is why oncologists across India are repeatedly stressing one message: listen to the body early, not only when the symptoms become unbearable.

According to the Indian Council of Medical Research, cancer cases in India are steadily rising, and a large number of patients are still diagnosed in advanced stages. Early detection remains one of the strongest tools in improving survival and reducing treatment burden.

Dr Rohit Kumar C, Consultant - Surgical Oncology & Robotic Surgery, HIPEC & PIPAC Specialist, Aster Whitefield Hospital, says one of the biggest problems in India is the culture of self-medication.

“The main thing that we talk to everybody anywhere in India whenever we go for awareness talks is that it is impossible in India not to tell the patients to self-medicate. However, I tell they will go and do self-medication,” he says.

According to him, repeated use of antacids, painkillers, or over-the-counter medicines can temporarily hide symptoms that may actually need medical attention.

“So, because of self-medication what are we seeing? We are seeing masking of symptoms which are very early probably simple symptoms which could indicate towards some problem which if not evaluated can later come up with bigger problems,” he explains.

Doctors say this masking effect is especially seen in stomach-related cancers. People often continue treating “gas,” acidity, bloating, or indigestion for years without proper evaluation. The discomfort becomes familiar, and familiarity creates neglect.

One of the most striking things doctors want people to understand is that early-stage cancers are often silent.

“What as a cancer surgeon, I would want any patient of mine to understand is that most of the cancers in early stage, they whisper, they do not come and shout at you,” says Dr Rohit Kumar C.

That sentence reflects a reality many patients discover too late.

A persistent cough may seem seasonal. Fatigue may be blamed on work stress. Blood in stools may be dismissed as piles. A sudden change in appetite may be linked to irregular meals. But when these symptoms continue for weeks, recur frequently, or behave differently than before, doctors say they deserve attention.

Dr Rohit Kumar C explains that people often normalise symptoms by linking them to daily life.

“People do not give conscious time to listen to what their body is talking or telling them,” he says.

Doctors are not saying every symptom means cancer. Far from it. But they are urging people not to repeatedly silence the body’s warning signs without understanding the cause.

Some cancers are especially known for staying unnoticed in their early stages.

Dr Tejinder Kataria, MD, DNB, CCST, FIMSA, Chairperson, Division of Radiation Oncology, Medanta Cancer Institute, Medanta Gurugram, explains, “Not all cancers are accompanied by obvious or worrying signs and symptoms in their early stages; hence, it is essential to be aware and undergo health screening.”

She adds that many cancers begin with vague symptoms such as unexplained tiredness, weight loss, chronic cough, changes in bowel habits, persistent pain, or unusual bleeding.

“Sadly, some cancers like ovarian cancer, pancreatic cancer, lung cancer, and colorectal cancers can be asymptomatic until the condition becomes advanced,” she says.

This is one reason why ovarian cancer is often called a “silent” disease globally. Symptoms like bloating, pelvic heaviness, or loss of appetite may appear subtle and easily ignored.

Similarly, lung cancer in smokers may initially resemble a long-standing cough, while colorectal cancers may quietly develop through small bowel changes or occasional bleeding.

The World Health Organization has repeatedly stressed that awareness and screening play a major role in reducing cancer deaths worldwide.

Many people assume medical tests are only necessary after symptoms begin. Cancer specialists strongly disagree.

Dr Rohit Kumar C explains that screening is designed precisely for people who appear healthy.

“So, screening is for a normal person we are telling go to the hospital and get yourself checked. For what? For checking something that is without you knowing is being growing in you,” he says.

Screening tests can identify pre-cancerous changes or cancers at stages where treatment is simpler, cheaper, and more successful.

For example, Pap smear testing can detect cervical changes years before cancer fully develops. Mammography helps detect breast cancer early. Colonoscopy can identify abnormal growths in the colon before they become dangerous.

The Government of India’s National Health Mission also promotes population-based screening for common cancers including oral, breast, and cervical cancer through health centres across the country.

Dr Tejinder Kataria also highlights the importance of routine checks.

“Routine examinations such as mammography, Pap smear, colonoscopy, and mouth cancer screening can assist in the early detection of cancer, thus enhancing the effectiveness of treatment,” she says.

She further notes that low-dose CT chest scans may help detect early lung cancer in smokers with chronic cough.

Doctors say one of the most overlooked things is change itself.

A mole changing colour. A swelling becoming harder. A symptom disappearing and returning again. Persistent fatigue without explanation. These are not always emergencies, but they are conversations the body is trying to start.

Cancer specialists say awareness is not about living in fear. It is about becoming more attentive.

“The earlier the diagnosis, the simpler is the treatment, less cost financially for the patient, more chances of avoiding functional damage or preserving the organs,” says Dr Rohit Kumar C.

That single shift, from ignoring to investigating, can change outcomes dramatically.

Dr Tejinder Kataria also emphasises prevention through lifestyle choices.

“Additionally, taking up healthier behaviors such as quitting smoking, reducing alcohol intake, eating a healthy diet, engaging in physical activities, and controlling stress can reduce one’s chances of developing cancer.”

This article includes expert inputs shared with TOI Health by:

Dr Rohit Kumar C, Consultant - Surgical Oncology & Robotic Surgery, HIPEC & PIPAC Specialist, Aster Whitefield Hospital.
Dr Tejinder Kataria, MD, DNB, CCST, FIMSA Chairperson, Division of Radiation Oncology, Medanta Cancer Institute, Medanta Gurugram.

Inputs were used to highlight how several cancers develop quietly without obvious warning signs, why persistent or recurring symptoms should never be ignored, and why doctors stress timely screening and medical evaluation for early detection.