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Platelet Disorders
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Blood Heart Circulation

Platelet Disorders

Platelets, or thrombocytes, are essential blood cells formed in bone marrow that facilitate clotting to stop bleeding; however, abnormalities in their count or function can lead to serious health issues.

Low Platelet Count

A low number of platelets is called thrombocytopenia. This condition increases the risk of external or internal bleeding. While mild cases may not require treatment, more serious instances may necessitate medications or blood/platelet transfusions.

High Platelet Count

Having too many platelets increases the risk of blood clots. There are two primary classifications:

  • Thrombocythemia: A rare condition where the cause is unknown. Treatment depends on the presence of symptoms.
  • Thrombocytosis: A high platelet count caused by another underlying disease or condition. The outlook and treatment depend on the primary cause.

Platelet Dysfunction

In some cases, platelets are present but do not function correctly. For example, in von Willebrand Disease, platelets fail to stick together or attach to blood vessel walls, leading to excessive bleeding. Treatment for these disorders is tailored to the specific type of dysfunction present.

Frequently Asked Questions

Signs of a low platelet count (thrombocytopenia) include easy bruising, frequent nosebleeds, bleeding gums, prolonged bleeding from cuts, or tiny red spots on the skin (petechiae). A high platelet count (thrombocythemia or thrombocytosis) might cause symptoms related to blood clots, such as headaches, dizziness, weakness, or numbness, though it can also be asymptomatic. Platelet dysfunction often presents with similar bleeding symptoms as thrombocytopenia.
Platelet disorders are usually diagnosed through a complete blood count (CBC), which measures the number of platelets. If abnormalities are found, further tests may include a peripheral blood smear to examine platelet size and shape, platelet function tests to assess how well platelets are working, and sometimes bone marrow biopsy to investigate platelet production. Identifying the underlying cause is also a key part of diagnosis.
For low platelet counts or dysfunction, it's important to avoid activities that increase the risk of injury or bleeding, such as contact sports. You should also avoid medications that thin the blood, like aspirin or NSAIDs, unless specifically advised by your doctor. For high platelet counts, managing underlying conditions and sometimes taking anti-clotting medications are important. Always discuss specific precautions with your healthcare provider.
Platelet disorders can be both inherited and acquired. Some conditions, like von Willebrand Disease, are genetic and passed down through families. Others, such as thrombocytosis, are often acquired later in life due to an underlying medical condition like infection, inflammation, or certain cancers. Thrombocytopenia can also be acquired from medications, autoimmune diseases, or infections.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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