A second warning sign is bleeding in more than one place. Someone who develops unexplained bruises and also experiences frequent nosebleeds, bleeding gums, or unusually heavy menstrual bleeding may have a problem involving platelets or clotting. These symptoms do not establish a diagnosis, but their combination makes evaluation particularly important.
Pay attention to small red or purple spots
Petechiae are tiny red, purple, or brownish spots caused by small amounts of blood leaking beneath the skin. Unlike many ordinary bruises, they may look like pinpoint dots rather than a single large patch.
Petechiae can occur for several reasons, including pressure, infection, medication effects, and low platelet counts. Their presence alone does not establish a serious diagnosis. However, a sudden or widespread appearance, particularly with fever, weakness, or other signs of illness, deserves prompt assessment.
A rash that does not fade when pressed may also require medical attention depending on the circumstances. If a person develops a rapidly spreading purple or red rash together with fever, confusion, severe headache, or marked illness, emergency medical care may be necessary.
Do not wait for bruises to change color or become painful before seeking help if other symptoms suggest a serious problem.
Watch for changes in energy and general health
Unusual bruising may be more significant when accompanied by symptoms affecting the whole body.
Persistent fatigue that is unusual for the person, unexplained paleness, shortness of breath, recurring infections, or fever that persists or returns can sometimes indicate a problem involving blood cells or another underlying condition.
Unintentional weight loss and persistent night sweats may also warrant assessment, particularly when they occur with unexplained bruising or swollen lymph nodes.
These symptoms are common in many conditions, and most people who experience tiredness or a fever do not have cancer. What matters is whether the symptoms are persistent, unexplained, worsening, or appearing together in a new pattern.
If you have been feeling increasingly weak while noticing more bruises than usual, arrange a medical appointment rather than assuming that the symptoms are simply due to stress, age, or a busy schedule.
When is the situation an emergency?
Some bleeding problems require immediate medical attention.
Seek emergency help if bleeding is heavy or will not stop, if you vomit blood, or if you notice black, tar-like stools accompanied by signs of significant bleeding. Sudden severe headache, confusion, fainting, or new neurological symptoms can also indicate a serious emergency, particularly after a head injury.
A head injury deserves special caution in people taking anticoagulants or those who have been told their platelet count is low. Significant bleeding may occur even when external injuries appear minor.
A rapidly spreading purple rash with fever or severe illness is another reason to seek emergency care. Do not attempt to manage these symptoms at home while waiting to see whether they disappear.
For people who do not have emergency symptoms, the appropriate next step depends on the pattern and severity of the bruising. New, repeated, or unexplained bruises should be discussed with a healthcare professional, especially when accompanied by other bleeding symptoms.
How to prepare for a medical appointment
A few simple observations can help a clinician understand what is happening.
Record when the first bruise appeared, where it developed, and whether new bruises have followed. If practical, take photographs over time to document changes in size and appearance. Photographs can support the history but cannot replace an examination.
Make a list of prescription medicines, over-the-counter products, and supplements. Include any recent changes in treatment, previous bleeding problems, family history of clotting disorders, and recent infections.
Tell the clinician about other symptoms, even if they seem unrelated. Fatigue, fever, unusual bleeding, and weight changes may help guide decisions about testing.
Depending on the assessment, a clinician may order a complete blood count, platelet count, or clotting tests. Other investigations may be appropriate if the history or initial results point toward a particular cause.
The goal is not to test every person for every possible disease. It is to identify the most likely explanations, recognize potentially serious conditions, and choose investigations that answer relevant clinical questions.
Prompt evaluation can provide reassurance when bruising has a harmless explanation and help identify conditions that need treatment.
Chapter 5: What to Do About Bruises and How to Protect Your Health
If you notice a bruise, the first step is to consider whether an injury may have occurred. A mark that develops after a bump or minor accident can often be managed at home, provided there are no concerning symptoms or other reasons to seek medical attention.