Cancer Warning Signs: Symptoms That Should Never Be Ignored
Most of the symptoms on this list turn out to be something harmless. That is exactly why they are worth checking: the small proportion that are not are the cases where early detection changes everything.
Why timing matters so much
Cancer caught while confined to its original site is often curable with surgery alone. The same cancer caught after it has spread may be treatable but rarely curable. Survival differences between early and late stage are frequently measured in multiples, not percentages.
The main cause of late diagnosis is not a lack of tests. It is delay between noticing a symptom and seeing a doctor.
Symptoms that warrant prompt assessment
Any lump that is new, growing, hard, fixed or painless, whether in the breast, testicle, neck, armpit, groin or anywhere else. Painless is not reassuring; it is often the opposite.
Unexplained weight loss, meaning more than about 5 percent of body weight over six months without dieting.
Persistent cough lasting more than three weeks, a change in a long-standing cough, or coughing blood.
Change in bowel habit lasting more than three weeks: looser stools, increased frequency, constipation, or a sense of incomplete emptying.
Blood in the stool, or black tarry stools.
Blood in the urine, even once, even painless, even if it clears.
Difficulty swallowing, or food sticking.
Persistent indigestion or heartburn that is new, especially after age 50, or does not settle with treatment.
Unexplained bleeding: between periods, after sex, after menopause, or from the nipple.
A mouth ulcer or white or red patch that has not healed in three weeks, particularly in tobacco or areca nut users.
A skin lesion that is changing in size, shape or colour, has an irregular border, is multi-coloured, is larger than about 6 mm, itches, bleeds or will not heal.
Persistent abdominal bloating, especially in women, occurring most days for three weeks or more, with early fullness or pelvic pain.
Unexplained night sweats that soak clothing or bedding.
Unexplained fatigue that does not improve with rest.
New breathlessness, hoarseness lasting over three weeks, or unexplained pain in one place lasting over a month.
Unexplained bruising or bleeding, frequent infections, or bone pain.
What is less likely to be cancer
Short-lived symptoms that resolve, pain that moves around the body, symptoms that fluctuate dramatically day to day, and most tender, mobile, rapidly appearing lumps, which are usually infective or inflammatory.
This is context, not permission to wait. If a symptom persists beyond the time frames above, it needs a look.
Screening: looking before symptoms appear
Screening is different from investigating a symptom. It tests apparently well people to catch disease early.
Cervical cancer. HPV testing or Pap smear from around age 30, repeated at intervals set by the programme. HPV vaccination before exposure, ideally ages 9 to 14, prevents the great majority of cases. Cervical cancer is one of the most preventable cancers and remains among the most common in Indian women, which is a gap worth closing.
Breast cancer. Breast awareness, clinical examination, and mammography from around 40 to 50 depending on guidance and risk. Know what is normal for you and report change rather than relying on a monthly ritual.
Oral cancer. Visual examination of the mouth, particularly important for tobacco and areca nut users, and easily done at a dental visit.
Colorectal cancer. Faecal occult blood testing or colonoscopy from around 45 to 50, earlier with a family history or inflammatory bowel disease.
Lung cancer. Low-dose CT screening for heavy smokers in some programmes.
Prostate cancer. PSA testing is a discussion rather than a recommendation, because of over-diagnosis; talk through the benefits and harms with your doctor.
Family history matters. Cancer in a first-degree relative at a young age, multiple relatives with related cancers, or a known genetic syndrome all change screening timing and may justify genetic counselling.
Risk reduction
- Stop all tobacco, smoked and smokeless, and areca nut
- Limit alcohol; there is no clearly safe level for cancer risk
- Maintain a healthy weight
- Be physically active
- Eat more fibre, fruit and vegetables; reduce processed meat
- Protect skin from sun
- Get HPV and hepatitis B vaccinations
- Treat chronic hepatitis B and C, and Helicobacter pylori infection
- Reduce indoor air pollution from cooking fuels
- Attend screening when invited
How to use this list
Do not read it and conclude you are ill, and do not read it and decide to wait. Use the time frames: three weeks for most persistent symptoms, immediately for bleeding and lumps. A doctor would far rather see a hundred people with harmless symptoms than one person six months late.
This is general information, not a diagnostic tool. Persistent or unexplained symptoms should be assessed by a doctor.