Easy bruising and leukaemia: what to know

Bruising alone has many possible explanations and cannot diagnose leukaemia. A clinician considers the bruise pattern, other symptoms, medicines, medical history and blood-test results together.

Platelets help form plugs at damaged blood vessels. When leukaemia disrupts the bone marrow, platelet production may fall, allowing blood to collect beneath the skin after minor pressure or without a remembered injury. Small red or purple pinpoints called petechiae can arise from the same problem and do not fade when pressed.

Leukaemia may also present with bleeding from the nose or gums, unusual tiredness, paleness, repeated infections, fever, night sweats, swollen glands, bone discomfort or unexplained weight loss. These features are not specific to leukaemia, but a combination that persists warrants assessment.

Arrange a medical appointment if new bruises keep appearing, are unusually large, occur without a clear injury, or accompany petechiae or other bleeding. Note when the changes began and whether you have fatigue, fever, infections, weight loss or night sweats. Photographs taken over time can help show how the pattern changes.

Bring a complete list of prescription medicines, over-the-counter pain relievers, supplements and any family or personal history of bleeding. Do not stop prescribed medicine on your own. A clinician may examine your skin and lymph nodes and order a full blood count and blood film. Abnormal results may lead to specialist assessment and, when appropriate, a bone marrow biopsy.

Seek urgent medical care for bleeding that will not stop with firm pressure, blood in vomit, urine or stool, a rapidly enlarging bruise, or a sudden severe headache. Confusion, fainting, marked weakness, chest pain or difficulty breathing also requires immediate assessment.

After a significant head injury, get prompt medical advice if easy bruising or a low platelet count is known or suspected, even when the skin looks normal. If you have diagnosed leukaemia or are receiving treatment, follow your care team's instructions for fever, new bleeding or clusters of petechiae.

Ask whether your bruise pattern suggests a platelet or clotting problem, which blood tests are appropriate, and when results should be repeated. You can also ask which medicines may worsen bleeding, what changes should trigger urgent contact, and whether a haematology referral is needed.

If tests suggest leukaemia, ask what type is being considered, which tests can confirm it, how quickly decisions are needed, and what treatment or supportive care may be relevant to your situation.