Does having these symptoms mean I have cancer?

Almost certainly not. The vast majority of these symptoms are caused by common, non-cancerous conditions such as infections, hormonal changes, haemorrhoids or harmless lumps. The reason to get persistent or unexplained symptoms checked is simply that, in the small number of cases where cancer is the cause, finding it early gives the best chance of successful treatment. Getting checked is about peace of mind and prudence, not panic.

How long should I wait before seeing a doctor?

A useful guide is to seek review if a symptom is persistent or unexplained and has lasted more than about two weeks - for example, a cough, a change in bowel habits, or a lump that does not go away. Some symptoms warrant earlier attention: any post-menopausal bleeding, coughing up blood, or significant unexplained bleeding should be checked promptly rather than waited out.

If I feel completely well, do I still need cancer screening?

Yes. Many of the most common cancers - including breast, colorectal and cervical cancer - often cause no symptoms in their early stages, which is exactly when treatment works best. Singapore's national screening programmes under Healthier SG are designed to detect these cancers before symptoms appear, and are recommended and subsidised based on your age and risk. Screening when you feel well is one of the most effective things you can do.

Should I see a GP or go straight to a cancer specialist?

For most symptoms, start with your GP or polyclinic doctor. They can assess your symptoms, arrange initial tests, and refer you to a specialist or a cancer centre such as NCCS or NCIS if needed. Going through a GP first is usually the most efficient route and ensures you get the right tests in the right order.

What symptoms need urgent medical attention?

Seek prompt medical care for red-flag symptoms such as coughing up blood, a large amount of blood in your stool or urine, significant unexplained bleeding, or severe unexplained pain. These do not necessarily mean cancer, but they should be assessed quickly. If a symptom feels alarming or is rapidly worsening, do not wait.

Cancer Warning Signs and Symptoms: When to See a Doctor in Singapore

Written & reviewed by the BestDoctors.sg editorial team · Last updated 2 Jul 2026 · General information, not medical advice

Quick answer. Many early cancers cause no symptoms at all, which is why regular screening (for breast, cervical and colorectal cancer under Healthier SG) matters even when you feel well. But certain persistent or unexplained signs – a new or changing lump, unexplained weight loss, abnormal bleeding (in your stool, urine or vaginally), a sore that won’t heal, a changing mole, or a persistent cough, hoarseness or indigestion – that last longer than about two weeks should be checked by a doctor. These symptoms are most often caused by something other than cancer, but it is always worth getting them checked early, because earlier diagnosis improves outcomes. Start with your GP or polyclinic, and seek urgent care for red-flag symptoms such as coughing up blood or significant unexplained bleeding.

Worrying about cancer is natural, but it helps to keep things in perspective: most everyday symptoms are caused by minor, non-cancerous conditions, and many early cancers cause no symptoms at all. That is precisely why screening is so important – it can catch cancer before you would ever notice it. At the same time, knowing which persistent or unexplained signs deserve a doctor’s attention means you can act early if something does feel wrong. This guide outlines the general and site-specific warning signs recognised by Singapore cancer authorities, and explains calmly when and where to seek help.

At a glance

Common cancer warning signs and when to see a doctor in Singapore
Warning sign	What to look for	When to see a doctor
New or changing lump	A new lump or thickening in the breast, testicle, neck, armpit or anywhere on the body	If a lump is new, growing, or has not gone after about 2 weeks
Unexplained weight loss	Losing around 5kg or more without trying	If weight loss is unexplained and ongoing
Change in bowel/bladder habits or blood in stool or urine	Persistent diarrhoea or constipation, blood in stool or urine, new urinary changes	If changes persist beyond about 2 weeks, or if you see blood
Abnormal vaginal bleeding	Bleeding between periods, after sex, or after menopause, or foul-smelling discharge	Promptly – any post-menopausal or unexplained bleeding should be reviewed
Persistent cough or hoarseness	A cough or voice change that does not settle; coughing up blood	After ~3 weeks of cough/hoarseness; urgently if coughing up blood
Difficulty swallowing or persistent indigestion	Ongoing indigestion, bloating, early fullness, or trouble swallowing	If symptoms are persistent or worsening
Sore that does not heal	An ulcer or sore (including in the mouth) that won't heal	If it has not healed after a few weeks
New or changing mole	Changes in colour, shape, size or border (ABCDE), or itching/bleeding	Promptly, for any clearly changing mole or skin lesion

Why screening matters more than waiting for symptoms

One of the most important facts about cancer is that many of the most common types – including breast, colorectal, lung and prostate cancer – often develop silently, with no noticeable symptoms in their early, most treatable stages. By the time symptoms appear, the disease may already be more advanced.

This is why Singapore runs national screening programmes for breast, cervical and colorectal cancer, which are recommended and heavily subsidised under Healthier SG. Screening is the process of detecting cancer before symptoms appear, with the goal of finding it early when it is still curable. If you are eligible by age, it is worth going for recommended screening even if you feel completely well. Importantly, if you develop symptoms – such as blood in your stool – you should see a doctor promptly even if you recently had a normal screening result.

General warning signs to be aware of

Singapore cancer centres describe a set of general warning signs that, while usually due to non-cancer causes, are worth checking if they are persistent or unexplained:

Unexplained weight loss – losing around 5kg or more without trying can sometimes be a first sign of cancer.
Persistent fatigue that does not improve with rest.
Fever or night sweats with no obvious cause.
A new or changing lump or thickening anywhere on the body – in the breast, testicles, neck, armpit or soft tissues.
Persistent or unexplained pain that does not settle.
Unusual bleeding or discharge from any part of the body.

A single mild symptom for a day or two is rarely a concern. The key is persistence: a useful rule of thumb is that symptoms lasting more than about two weeks deserve a check with your doctor.

Site-specific warning signs

Some signs point more specifically to particular cancers. None of these mean you have cancer – they are far more often caused by benign conditions – but they should be reviewed by a doctor if they persist:

Change in bowel or bladder habits, or blood in stool or urine – persistent changes in bowel habits, blood in the stool, or new urinary changes (colorectal and other cancers).
A breast lump or nipple change – a new lump, skin or nipple changes, or swelling in the breast, armpit or collarbone (breast cancer).
Abnormal vaginal bleeding – bleeding between periods, after sex, or after menopause, or a foul-smelling bloody discharge (cervical and other gynaecological cancers).
A persistent cough or coughing up blood – a cough that does not go away (lung cancer).
Difficulty swallowing or persistent indigestion – ongoing indigestion, bloating, early fullness or trouble swallowing (stomach and oesophageal cancers).
A sore or ulcer that does not heal on any part of the body, including the mouth.
A new or changing mole – any change in colour, shape, size or loss of a defined border (skin cancer; see the ABCDE guide below).
Persistent hoarseness or a change in your voice that does not settle.

The ABCDE guide for moles and skin changes

For moles, the ABCDE checklist helps you spot changes that warrant a doctor’s review:

A – Asymmetry: one half does not match the other.
B – Border: edges that are irregular, ragged or blurred.
C – Colour: uneven colour, or several shades within one mole.
D – Diameter: larger than about 6mm, or growing.
E – Evolving: any change in size, shape, colour, or new symptoms such as itching or bleeding.

Skin cancers such as melanoma can often be treated successfully when caught early, so report any changing mole or wart to your doctor.

When and where to seek help in Singapore

For most persistent symptoms, the best first step is to see your GP or polyclinic doctor. They can assess your symptoms, arrange tests if needed, and refer you to a specialist or cancer centre if appropriate. You do not need to wait for symptoms to become severe – if something has lasted more than about two weeks, or is unexplained, it is reasonable to get it checked.

Some symptoms warrant more urgent attention. Seek prompt medical care if you experience coughing up blood, significant or unexplained bleeding (such as a large amount of blood in your stool or urine), severe unexplained pain, or any symptom that feels alarming. Acting early does not mean you have cancer – in most cases you will be reassured – but it gives you the best chance of a good outcome if something is wrong.

Related guides

Best Oncology Clinics in Singapore — our editorial shortlist
oncology clinics directory
Cancer screening by age & sex
Breast cancer screening & mammograms
Cancer treatment cost & MediShield

Sources

Last updated 21 June 2026. Prices are typical market ranges gathered from the cited sources and vary by clinic, doctor and individual case — they are not quotes. This guide is general information, not medical advice; always consult a qualified, MOH-accredited doctor before any treatment.

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