Cancer Prevention: 7 Early Warning Signs You Must Never Ignore

What Is Cancer?

Cancer begins when cells in a part of the body change, grow uncontrollably and ignore the signals that normally limit growth. These cells may form a lump (tumour) or, in the case of blood cancers, circulate in the blood and marrow. Some tumours are benign and stay where they are, while malignant tumours invade nearby tissues and can spread (metastasise) to other organs.

Cancer is caused by damage to the genes that control cell growth. This damage can be inherited, but most often accumulates over time from exposure to tobacco, infections, radiation, certain chemicals, ageing and random errors during cell division.

Seven Early Warning Signs You Must Never Ignore

Having one of these signs does not mean you have cancer. Most have benign explanations. But persistent or unexplained changes should always be examined by a doctor.

1. A new lump or thickening

A lump in the breast, neck, armpit, groin, testicle or anywhere under the skin that is persistent or growing needs evaluation. Breast lumps should be assessed by a doctor even if they do not hurt.

2. Unexplained weight loss

Losing more than about 5 percent of body weight over six months without trying, together with tiredness or loss of appetite, can be an early sign of cancers of the stomach, pancreas, lung or blood, and of other conditions such as thyroid disease or diabetes.

3. Persistent changes in bowel or bladder habits

Lasting constipation or diarrhoea, blood in the stool, black stools, narrow stools, blood in the urine, or pain or difficulty passing urine require evaluation. These can be signs of colorectal, bladder or prostate cancer, though piles, infections and stones are far more common causes.

4. A sore that does not heal or a changing mole

An ulcer in the mouth, on the tongue or on the skin that does not heal in three weeks, a white or red patch in the mouth, or a mole that changes in size, colour or shape should be examined. Tobacco chewers and smokers are at particular risk of oral cancers.

5. Unusual bleeding or discharge

Bleeding between periods, after menopause or after intercourse, blood in sputum, coughing up blood, vomiting blood, or a bloody nipple discharge needs prompt attention.

6. Persistent cough, hoarseness or difficulty swallowing

A cough lasting more than three weeks, especially in smokers or former smokers, a hoarse voice that does not improve, food sticking in the throat or chronic indigestion can be signs of lung, throat, oesophageal or stomach cancer.

7. Persistent fatigue, fever, night sweats or pain

Unexplained constant tiredness, recurrent fevers or night sweats can accompany blood cancers and lymphomas. Pain that does not go away, such as persistent back pain, headache or bone pain, can sometimes be due to cancer, particularly if it is worsening and unexplained.

Risk Factors You Can Change

Around one in three cancers is linked to modifiable risks.

• Tobacco in all forms: smoking cigarettes and bidis, chewing tobacco, gutka, paan with tobacco and hookah are the biggest preventable causes of cancer in India, linked to cancers of the mouth, throat, lung, oesophagus, bladder and more. Quitting at any age lowers risk.
• Alcohol: raises the risk of cancers of the mouth, throat, liver, breast and bowel, and the risk increases with the amount.
• Unhealthy diet: diets high in processed and red meat, refined foods and low in fibre, fruits and vegetables increase risk of bowel cancer; food contaminated with aflatoxin raises liver cancer risk.
• Excess weight and inactivity: linked to cancers of the breast (after menopause), colon, uterus, kidney and others.
• Infections: HPV (cervical and other cancers), hepatitis B and C (liver cancer) and Helicobacter pylori (stomach cancer) are preventable or treatable.
• Sun exposure: ultraviolet radiation causes skin cancer.
• Air pollution and occupational chemicals: such as asbestos, benzene and silica dust.
• Radiation: unnecessary scans and prolonged exposure should be avoided.

Risk Factors You Cannot Change

Age, family history of certain cancers, inherited gene changes such as BRCA1 and BRCA2 for breast and ovarian cancer, and some medical conditions raise risk. If you have several relatives with the same or related cancers, or cancer at a young age, ask your doctor about genetic counselling and earlier screening.

Vaccination and Prevention

• HPV vaccine: protects against infection that causes most cervical cancers and some cancers of the throat and genitals. It is recommended for girls and boys before they become sexually active, and some adults may benefit after discussion with a doctor.
• Hepatitis B vaccine: prevents infection that can lead to liver cancer.
• Treating hepatitis C and H. pylori reduces later cancer risk.
• Sun protection: use sunscreen, protective clothing and shade during peak hours.

Screening Tests

Screening looks for cancer or pre-cancer before symptoms appear. Recommendations vary by country and guideline, but commonly include:

• Cervical cancer: Pap smear or HPV testing, usually starting around age 25 to 30 and repeated every few years.
• Breast cancer: monthly breast self-awareness, clinical breast examination, and mammography generally from age 40 to 45 every one to two years, earlier with family history.
• Colorectal cancer: colonoscopy or stool-based tests starting at age 45 to 50.
• Oral cancer: an oral examination, especially for tobacco users, and visual checks at routine dental visits.
• Lung cancer: low-dose CT in selected heavy smokers aged 50 or more, as advised by a doctor.
• Prostate cancer: a discussion about PSA testing for men from about age 50, or earlier with family history.
• Skin: regular self-checks and a dermatology exam if you have many moles or a history of sun exposure.

Always discuss which tests are right for your age, family history and health, because screening has benefits and limits.

Healthy Habits That Lower Risk

1. 1Do not use tobacco in any form.
2. 2Limit or avoid alcohol.
3. 3Eat a plant-rich diet with plenty of vegetables, fruits, whole grains and pulses, and limit processed meats and charred or heavily fried food.
4. 4Keep a healthy weight and be active for at least 150 minutes each week.
5. 5Breastfeed if you can, which lowers breast cancer risk for the mother.
6. 6Get vaccinated against HPV and hepatitis B.
7. 7Practise safe sex and avoid sharing needles.
8. 8Protect your skin from the sun.
9. 9Attend regular health check-ups and recommended screenings.
10. 10Manage stress and sleep well.

Early Diagnosis Changes Outcomes

When a cancer is found early, it is often smaller, has not spread and may be treated with surgery alone or with less intensive therapy. Treatments include surgery, chemotherapy, radiation, hormonal therapy, targeted therapy and immunotherapy, often combined by a multidisciplinary team. Survival rates for many cancers, including breast, cervical, colorectal and oral cancers, are far higher when diagnosed at an early stage. Treatment is also now more personalised, with fewer side effects and better supportive care.

What to Do If You Notice a Warning Sign

1. 1Do not panic, but do not wait. Make an appointment within a week or two.
2. 2Write down your symptoms: when they started, how they have changed and anything that makes them better or worse.
3. 3Bring previous medical reports and a list of medicines.
4. 4Ask your doctor what tests are needed and when results will be ready.
5. 5If cancer is suspected, ask for referral to an oncology team and bring a family member for support.

Care at Trustmed Hospital

At Trustmed Hospital in Badshahpur, Gurugram, our general medicine and surgery teams provide health check-ups, evaluate lumps and warning symptoms with diagnostics and coordinate onward cancer care when needed. Book an appointment for a check-up.

Key Takeaways

• A large share of cancers can be prevented by avoiding tobacco, limiting alcohol, staying active, eating well and getting vaccinated.
• Persistent lumps, unexplained weight loss, bleeding, sores that do not heal and lasting changes in bowel or bladder habits need prompt evaluation.
• Screening for cervical, breast, colon and oral cancers finds disease early, when treatment works best.
• Most warning signs turn out to be harmless, but checking early gives peace of mind or a head start.

Quick Checklist

1. 1Quit tobacco in every form, and ask for help if you need it.
2. 2Book age-appropriate screening tests this year.
3. 3Check your skin and mouth monthly.
4. 4Ask your doctor about HPV and hepatitis B vaccination.

Frequently Asked Questions