Immune thrombocytopenic purpura (ITP) is a bleeding disorder in which the immune system destroys platelets, which are necessary for normal blood clotting. People with the disease have too few platelets in the blood.
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ITP occurs when certain immune system cells produce antibodies against platelets. Platelets help your blood clot by clumping together to plug small holes in damaged blood vessels.
The antibodies attach to the platelets. The body destroys the platelets that carry the antibodies.
In children, the disease sometimes follows a viral infection. In adults, it is more often a long-term (chronic) disease and can occur after a viral infection, with use of certain drugs, during pregnancy, or as part of an immune disorder.
ITP affects women more often than men. It is more common in children than adults. In children, the disease affects boys and girls equally.
ITP symptoms can include any of the following:
Abnormally heavy periods in women
Bleeding into the skin, often around the shins, causing a skin rash that looks like pinpoint red spots (petechial rash)
In children, the disease usually goes away without treatment. Some children may need treatment.
Adults are usually started on a steroid medicine called prednisone or dexamethasone. In some cases, surgery to remove the spleen (splenectomy) is recommended. This increases the platelet count in about half of people. However, other drug treatments are usually recommended instead.
If the disease does not get better with prednisone, other treatments may include:
Infusions of high-dose gamma globulin (an immune factor)
Drugs that suppress the immune system
Anti-RhD therapy for people with certain blood types
Drugs that stimulate the bone marrow to make more platelets
People with ITP should not take aspirin, ibuprofen, or warfarin, because these drugs interfere with platelet function or blood clotting, and bleeding may occur.
More information and support for people with ITP and their families can be found at:
Arnold DM, Zeller MP, Smith JW, Nazy I. Diseases of platelet number: Immune thrombocytopenia, neonatal alloimmune thrombocytopenia, and posttransfusion purpura. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 131.
Todd Gersten, MD, Hematology/Oncology, Florida Cancer Specialists & Research Institute, Wellington, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.