Immune Thrombocytopenia: Symptoms, Causes, and Treatment
Updated: 3 days ago
Medically reviewed by [Dr. Baraa Alnahhal, MD](https://www.rinnit.com/dr-baraa-alnahhal). Last reviewed October 13, 2026. This content is for educational purposes and is not medical advice.
Quick Answer
Immune thrombocytopenia (ITP) is a disorder in which the immune system destroys platelets, the cells that help blood clot, leaving levels too low. [1] Signs include easy bruising, tiny reddish-purple skin dots, nosebleeds and heavy menstrual flow. [1] In children it often follows a virus. [1] Mild cases may need only watchful waiting, while treatment can include steroids and platelet-raising medicines. [2]
What the research says
An international expert panel updated ITP care in 2019. The consensus report reviewed studies published between 2009 and 2018 and gives recommendations for diagnosis and management in adults, during pregnancy, and in children, including quality-of-life considerations (Provan et al., Blood Adv, 2019). [6]
Romiplostim raised platelet counts in randomized trials. Across 9 randomized trials (748 patients), platelet response was about 6 times more likely with romiplostim than with placebo (RR 6.10), and the need for rescue therapy was roughly halved (RR 0.49) (Ahmed et al., Clin Appl Thromb Hemost, 2026). [7]
Avatrombopag showed high response and few clots in real-world use. Pooling 15 studies of adults, 80.0% responded, the median time to response was 11 days, and thromboembolic events occurred in 2.82% of patients (Lozano and Valcarcel, Eur J Haematol, 2026). [8]
Key Facts at a Glance
Aspect | Summary |
Also known as | Idiopathic thrombocytopenic purpura (former name) [1] |
Core problem | Immune system destroys platelets, lowering clotting ability [1] |
Who it affects | More common in young women; children often recover on their own [1] |
Main skin signs | Easy bruising, petechiae, purpura [1] |
Typical course in adults | Often chronic, lasting months or years [1] |
Key emergency sign | Bleeding that cannot be controlled with pressure [1] |
What Is Immune Thrombocytopenia?
Platelets are small blood cells that rush to the site of any leak or injury and help form a clot. ITP happens when the number of these cells drops too low, so bleeding and bruising happen far more easily than they should.
The disorder was once called idiopathic thrombocytopenic purpura. [1] "Idiopathic" means the cause was unknown, "thrombocytopenia" means low platelet count, and "purpura" refers to the purple bruises and patches it produces. As research advanced, doctors learned the immune system is the true culprit — so the name shifted to immune thrombocytopenia. The old name still appears on many lab reports and older records.
Symptoms
ITP might not cause any symptoms at all. [1] [3] A low platelet count is often discovered by accident during a blood test ordered for something else. [2] When symptoms do appear, they are mostly about bruising and bleeding.
The most recognizable skin signs come in three forms. Easy bruising appears from minor bumps that would not normally leave a mark. Petechiae are tiny reddish-purple dots from bleeding under the skin, usually on the lower legs, that look like a rash — they may appear red or purple on lighter skin and brown or hard to see on Black or brown skin. [1] Purpura refers to larger purple patches of bleeding under the skin, bigger than petechiae. [1]
Beyond the skin, bleeding can show up in the gums and nose, in the urine or stool, and as unusually heavy menstrual flow. [1] [3]
When to See a Doctor
Make an appointment if you or your child has symptoms that worry you, such as unexplained bruising or rash-like dots. Bleeding that will not stop is a medical emergency. [1] Get help right away if usual first aid — such as applying firm pressure — cannot control the bleeding. [1]
What Causes ITP?
ITP usually happens when the immune system makes a mistake. [1] It produces antibodies that attack and destroy the body's own platelets, which are then removed, most often in the spleen.
What triggers that mistake can differ by age:
In most children, the disorder follows a virus and most often resolves without any treatment. [1] In adults, the illness often persists for months or years. [1]
Risk Factors
ITP is more common among young women. [1] Risk also appears higher in people who have other conditions in which the immune system attacks healthy tissues, such as rheumatoid arthritis or lupus. [1]
Complications
Rarely, ITP causes bleeding into the brain, which can be fatal. [1] This is the most serious potential complication of the disorder.
Pregnancy adds extra considerations. A person who is pregnant with a low platelet count or who is bleeding faces a greater risk of heavy bleeding during delivery. [1] A health care provider might suggest treatment to keep the platelet count steady. [1] ITP does not usually affect the fetus, but the baby's platelet count should be tested soon after birth. [1]
How Is It Diagnosed?
Because no single test can prove the diagnosis, a health care provider works to rule out other possible causes of bleeding and a low platelet count. [2] Blood tests check platelet levels, and a referral to a hematologist — a specialist in blood diseases — is common. [2] Rarely, adults might need a bone marrow biopsy to rule out other problems. [2]
How Is It Treated?
The treatment path depends on how severe the case is. People with mild ITP who are not bleeding and whose platelet count is not too low might need only regular platelet checks. [1] [2] Children usually improve without treatment. [2] Most adults with ITP will need treatment at some point, since the condition often becomes chronic. [2] A provider can walk through the pros and cons of each option — some people find that the side effects of treatment are worse than the disease itself. [2]
Treatment | What it does | Things to know |
Watchful waiting | Regular platelet checks only [2] | |
Steroids (e.g., prednisone) | First-line medicine that reduces the immune attack | Tapered gradually once counts are safe; long-term use raises risk of infections, high blood sugar, and osteoporosis [2] |
Immune globulin | Injection that quickly raises platelet counts [2] | Used when steroids don't work, for serious bleeding, or before surgery; effect wears off in a couple of weeks [2] |
Platelet-raising drugs | Can increase the risk of blood clots [2] | |
Other immune drugs | Rituximab reduces the immune response damaging platelets; fostamatinib is approved for long-lasting ITP unresponsive to other treatments [2] | Rituximab can reduce how well vaccinations work [2] |
Splenectomy | Surgery to remove the spleen [2] | Often ends the attacks on platelets quickly, but doesn't work for everyone; raises infection risk [2] |
Before starting any treatment, tell your provider about all medicines and supplements taken without a prescription. Some — such as aspirin, ibuprofen, and ginkgo biloba — can increase bleeding and may need to be stopped. [2]
Emergency Treatment
Rarely, ITP causes a great deal of bleeding. Emergency care usually includes a transfusion of blood rich in platelets. [2] Steroids and immune globulin given through a vein might also help. [2]
Living With ITP: Home Care Tips
Daily habits matter for anyone living with ITP. Contact sports should be avoided — a blow to the head during activities like boxing, martial arts, or football could cause bleeding in the brain. [2] Ask your provider about which activities are safe for you.
If your spleen has been removed, watch closely for signs of infection, including fever, and get treatment quickly. Infections can be more serious in people without a spleen. [2]
Be careful with nonprescription medicines. Pain relievers such as aspirin and ibuprofen can increase bleeding risk, so check with your provider before using them. [2]
Preparing for Your Appointment
Before your visit, prepare a list of your symptoms and when they began, key personal information such as major stresses or recent illnesses, and all medicines, vitamins, and supplements with doses. Taking a family member or friend along can help you remember the information you receive.
Useful questions to ask include: How many platelets do I have? Is my count too low? What is causing my ITP? Is this temporary or long lasting? What treatments are available and which do you recommend? What side effects are possible? What happens if I do nothing? Are there activity restrictions I should follow?
Conclusion
ITP is a platelet disorder driven by an immune system mistake — but it is manageable. Many people need only watchful waiting, children frequently recover on their own, and adults have a ladder of effective treatment options from steroids to newer platelet-raising medicines and surgery. Knowing your skin signs, avoiding unnecessary bleeding risks, and acting fast on uncontrolled bleeding are the three habits that keep ITP under control.
FAQ
What is immune thrombocytopenia (ITP)?
ITP is a bleeding disorder in which the immune system mistakenly attacks and destroys platelets, the cells that help blood clot. [1] Low platelet levels lead to easy bruising and bleeding. [1] It was formerly called idiopathic thrombocytopenic purpura. [1]
What are the symptoms of ITP?
ITP may cause no symptoms at all. [1] [3] When signs appear, they include easy bruising, tiny reddish-purple dots on the skin called petechiae (usually on the lower legs), larger purple patches called purpura, gum or nosebleeds, blood in urine or stool, and very heavy menstrual flow. [1]
What causes ITP?
The immune system produces antibodies that attack its own platelets, which are then destroyed, most often in the spleen. In children it often follows a viral infection like mumps or the flu. [1] In adults it can be linked to HIV, hepatitis, or H. pylori, the bacteria that causes stomach ulcers. [1]
Does ITP go away or is it permanent?
In children, ITP often follows a virus and usually gets better without treatment. [1] In adults, it typically lasts months or years and often becomes chronic, though treatments can raise platelet counts and control symptoms effectively.
When should I seek emergency care for ITP?
Bleeding that will not stop is a medical emergency. [1] Seek help right away if the bleeding cannot be controlled with usual first aid, such as applying pressure to the area. [1]
Trusted External Resources
Related Reading
MPV Blood Test (Mean Platelet Volume): Normal Range, High and Low Results explains the blood test that measures platelet size and helps evaluate this condition.
Learn more in our guide to Complete Blood Count (CBC): What It Measures, Normal Ranges and Abnormal Results.
Learn more in our guide to Platelet Count (PLT) Blood Test: Normal Range, Low and High Results Explained.
References
Mayo Clinic Staff. Immune thrombocytopenia (ITP) - Symptoms and causes. Mayo Clinic. April 29, 2025. https://www.mayoclinic.org/diseases-conditions/idiopathic-thrombocytopenic-purpura/symptoms-causes/syc-20352325
Mayo Clinic Staff. Immune thrombocytopenia (ITP) - Diagnosis and treatment. Mayo Clinic. April 29, 2025. https://www.mayoclinic.org/diseases-conditions/idiopathic-thrombocytopenic-purpura/diagnosis-treatment/drc-20352330
National Heart, Lung, and Blood Institute. Platelet Disorders - Immune Thrombocytopenia (ITP). NHLBI, NIH. Last updated July 24, 2025. https://www.nhlbi.nih.gov/health/immune-thrombocytopenia
Ferri FF. Immune thrombocytopenic purpura. In: Ferri's Clinical Advisor 2023. Elsevier; 2023.
UpToDate. Initial treatment and treatment of bleeding in adults with immune thrombocytopenia (ITP). UpToDate. Accessed October 30, 2026. https://www.uptodate.com/contents/initial-treatment-and-treatment-of-bleeding-in-adults-with-immune-thrombocytopenia-itp
Provan D, Arnold DM, Bussel JB, et al. Updated international consensus report on the investigation and management of primary immune thrombocytopenia. Blood Adv. 2019;3(22):3780-3817. PMID 31770441. https://doi.org/10.1182/bloodadvances.2019000812
Ahmed H, Khan MS, Zulfiqar D, et al. Efficacy and Safety of Romiplostim Versus Placebo in Immune Thrombocytopenia: A Systematic Review and Meta-Analysis. Clin Appl Thromb Hemost. 2026;32:10760296261476820. PMID 42559680. https://doi.org/10.1177/10760296261476820
Lozano ML, Valcarcel D. Real-World Safety and Efficacy of Avatrombopag in Adults with Immune Thrombocytopenia: A Systematic Review and Meta-Analysis. Eur J Haematol. 2026;117(1):174-185. PMID 41863412. https://doi.org/10.1111/ejh.70171
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