Immune thrombocytopenic purpura is a disease of immune-mediated thrombocytopenia, and the symptoms are mainly bleeding from various sites. The severity of bleeding in patients is related to the degree of thrombocytopenia, which can be mild with no bleeding tendency, or severe with a platelet count <20X109/L. Clinical symptoms mainly include skin purpura, petechiae and petechiae, usually without subcutaneous or joint hematoma; bleeding from the nose, gums and oral mucosa may occur, and patients with severe thrombocytopenia may have oral blood blisters; female patients may have excessive menstruation, which may sometimes be the only symptom; bleeding from the gastrointestinal tract and urinary system often manifests as black stools and hematuria, and vomiting blood is rare. Children often have a history of acute upper respiratory tract infection or other viral infections before the onset of the disease, and the onset of the disease is often acute, and platelets are often significantly reduced. The symptoms of immune thrombocytopenic purpura are mainly the manifestations of bleeding in various systems due to thrombocytopenia, and a clear diagnosis can lead to timely individualized treatment and delay the progression of the disease.