“Immune thrombocytopenia-ITP is rare. Each year, about 4 in 100,000 children and 3 in 100,000 adults in the United States learn they have this condition.

Types of immune thrombocytopenia

The two ITP types are:

• Primary ITP: This is when your immune system attacks your platelets. About 80% of all cases are primary ITP. Healthcare providers may call immune thrombocytopenia an autoimmune disorder.
• Secondary ITP: This may happen if you have underlying conditions like chronic infections, blood cancers or autoimmune disorders that affect your platelet levels.”

Cleveland Clinic (Immune Thrombocytopenia (ITP): Symptoms, Diagnosis & Treatment)