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    Cancer warning signs: symptoms that should be checked by a doctor

    Lumps, unexplained weight loss, unusual bleeding, a cough or hoarseness that will not go away, and changes to bowel habits or moles are among the possible cancer symptoms listed by the NCI and NHS.[1][2] Most such symptoms have other causes, but the NCI advises seeing a doctor if they last more than a few weeks.[3]

    Editor reviewedStrict sourcingUpdated ExplainerHealth and medicine, Life sciences

    Many cancers produce symptoms before they are diagnosed, and noticing them early matters. WHO says cancer found early is more likely to respond to treatment, with better survival, less illness from treatment and lower cost.[4] This page lists the possible signs named by the US National Cancer Institute (NCI) and the NHS, and explains when to act.

    This page is not medical advice. If you notice a symptom that is new or unusual for you, talk to a doctor or other clinician. Do not use this list to rule anything in or out.

    Common possible signs

    The NHS lists general symptoms that could be a sign of cancer:[2]

    • a new lump or swelling anywhere on the body
    • heavy sweating at night, or a high temperature that lasts or keeps coming back
    • feeling more tired than usual
    • unusual bruising or bleeding, such as blood in your poo or pee
    • pain that is not usual for you
    • losing weight without trying

    The NCI’s list adds breast lumps or nipple changes, changes in bowel habits, a cough or hoarseness that does not go away, a new or changing mole, a sore that does not heal, and fever or night sweats with no known cause.[1]

    Symptom lists are organised by body system. Common entries from the NHS and NCI lists include:

    AreaExamples
    Chest and breathingCough or breathlessness that does not improve; coughing up blood[5]
    DigestionFrequent or worsening heartburn; difficulty swallowing; blood in the stool or a change in bowel habits[5][1]
    Throat and mouthA hoarse voice that does not get better[5]
    BreastA lump or firm feeling in the breast or armpit; nipple changes or discharge[1]
    GynaecologicalBleeding between periods, after sex or after the menopause[5]
    SkinA new or changing mole; a sore that does not heal; yellowing of the skin or eyes (jaundice)[1][5]
    Whole bodySevere lasting fatigue; fever or night sweats with no known cause; unexplained weight change[1]

    The NHS notes that jaundice can be harder to see on black or brown skin.[5]

    Why most symptoms are not cancer, and why they still matter

    The NCI says these symptoms are most often caused by illness, injury, benign tumours or other problems. It advises seeing a doctor if they do not improve after a few weeks.[3] The NHS gives the same advice: the symptoms are common and usually have other causes, but they should be checked, because cancer found early may be easier to treat.[6] The NCI also warns that cancer often does not cause pain, so pain is not a reason to wait.[7]

    Younger adults are not exempt

    Colorectal cancer is now the leading cause of cancer death in US adults under 50, and its incidence rose by 3% a year among people aged 20 to 49, according to the American Cancer Society’s 2026 report. The authors call for better education of clinicians and the public about colorectal cancer symptoms.[8] Screening ages do not apply to people with symptoms. USPSTF recommendations cover only people without signs or symptoms.[9]

    What happens next

    A doctor will usually ask about the symptom and may order tests or refer you to a specialist. In England, guidance says cancer should be confirmed or ruled out within 28 days of an urgent referral.[10] WHO describes early diagnosis as three steps: knowing the symptoms and seeking advice, getting a clinical evaluation, and timely referral to treatment.[4]

    Symptom checks and screening are separate routes. Screening tests people who feel well,[11] and the cancer screening explainer covers who is offered it and when. To lower risk in the first place, see cancer prevention explained.

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    Questions readers ask

    What are the early warning signs of cancer?

    The NHS lists general signs such as a new lump or swelling, heavy night sweats or a lasting high temperature, unusual tiredness, unusual bruising or bleeding, unexplained pain, and losing weight without trying.[2]

    How long should I wait before seeing a doctor about a symptom?

    The NCI advises seeing a doctor if symptoms do not get better after a few weeks, so that problems can be diagnosed and treated as early as possible.[3]

    Does cancer always hurt?

    No. The NCI notes that cancer often does not cause pain, so people should not wait for pain before seeing a doctor.[7]

    If I have one of these symptoms, does it mean I have cancer?

    Usually not. The NHS says most of these symptoms are very common and can be caused by other conditions, but it is important to get checked.[6]

    How quickly will I get an answer after an urgent referral in England?

    NHS England guidance says cancer should be confirmed or ruled out within 28 days of an urgent referral to a specialist.[10]

    Sources

    · 11 claims from 5 publishers

    Each numbered claim is a statement we checked against the sources listed with it. Tap a number in the text to see its sources in place.

    1. [1]

      NCI's list of possible cancer symptoms includes breast lumps or nipple changes, blood in the stool or changed bowel habits, a cough or hoarseness that does not go away, a new or changing mole or a sore that does not heal, severe lasting fatigue, unexplained fever or night sweats, and unexplained weight change. confirmedas of 2026-10-11

    2. [2]

      The NHS lists general symptoms that could be a sign of cancer, including a new lump or swelling, heavy night sweats or a lasting or recurring high temperature, unusual tiredness, unusual bruising or bleeding, unexplained pain, and losing weight without trying. confirmedas of 2026-10-11

    3. [3]

      NCI advises seeing a doctor about symptoms that do not get better after a few weeks, noting that such symptoms are most often caused by something other than cancer. confirmedas of 2026-10-11

    4. [4]

      WHO says cancer identified early is more likely to respond to treatment, with better survival, less morbidity and less expensive treatment, and that early diagnosis depends on symptom awareness, access to evaluation and timely referral. confirmedas of 2026-10-11

    5. [5]

      Site-specific symptoms on the NHS list include a cough or breathlessness that does not get better, coughing up blood, persistent heartburn, problems swallowing, a hoarse voice that does not improve, unusual vaginal bleeding such as after the menopause, and yellowing of the skin or eyes (jaundice). confirmedas of 2026-10-11

    6. [6]

      The NHS says most of these symptoms are very common and usually caused by other conditions, but should be checked by a GP because cancer found early may be easier to treat. confirmedas of 2026-10-11

    7. [7]

      NCI notes that cancer often does not cause pain, so people should not wait for pain before seeing a doctor. confirmedas of 2026-10-11

    8. [8]

      The American Cancer Society's Colorectal cancer statistics, 2026 report says colorectal cancer is the leading cause of cancer death in US adults under 50, with incidence rising 3% a year at ages 20 to 49, and calls for educating clinicians and the public about its symptoms. confirmedas of 2026-10-11

    9. [9]

      USPSTF recommendations apply only to people without signs or symptoms of the condition. confirmedas of 2026-10-11

      • About the USPSTF · US Preventive Services Task Force · What We Do (retrieved 2026-10-11)
    10. [10]

      NHS England guidance says that after an urgent referral to a specialist, cancer should be confirmed or ruled out within 28 days. confirmedas of 2026-10-11

    11. [11]

      WHO distinguishes early diagnosis of symptomatic cancer from screening, which aims to find cancer or pre-cancer in people before symptoms develop. confirmedas of 2026-10-11

    Revision history (1)
    1. Page created.

    Created Oct 11, 2026. Last reviewed by an editor on Oct 11, 2026. Next scheduled review: Apr 11, 2027.

    Cite this page

    "Cancer warning signs: symptoms that should be checked by a doctor." ContentLora, updated Oct 11, 2026. https://contentlora.com/explain/cancer-warning-signs

    Spotted an error? Suggest a correction or emailcorrections@contentlora.com.

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