Idiopathic thrombocytopenia; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team and legal division. The reporter is the patient.  An 88-year-old male patient received BNT162b2 (BNT162B2), on 10Sep2021 as dose 3 (booster), single (Lot number: EW0191) at the age of 88 years, in in left upper arm, near shoulder for covid-19 immunisation. The patient's relevant medical history included: "Thyroidectomy" (not ongoing), notes: Thyroidectomy had this done about 40 years ago. The patient took concomitant medications. Vaccination history included: BNT162b2 (DOSE 1, SINGLE, Lot: E63244, last digit he is not sure if is a 4 or 6), administration date: 13Jan2021, for COVID-19 Immunization; BNT162b2 (DOSE 2, SINGLE, Lot: EC3246), administration date: 03Feb2021, for COVID-19 Immunization. The following information was reported: IMMUNE THROMBOCYTOPENIA (hospitalization) with onset 2021, outcome "recovering", described as "Idiopathic thrombocytopenia". The patient was hospitalized for immune thrombocytopenia (start date: Oct2021, discharge date: Oct2021, hospitalization duration: 11 day(s)). The event "idiopathic thrombocytopenia" required physician office visit and emergency room visit. The patient underwent the following laboratory tests and procedures: Platelet count: (Oct2021) 5000; (unspecified date) 1000; (unspecified date) 122,000. Therapeutic measures were taken as a result of immune thrombocytopenia.  Clinical course: This report was not related to a study or programme. Patient was calling about the COVID booster shot. He had the booster shot a year ago this past September, a month after that he came down with a major problem with his blood platelets and was hospitalized for 11 days. Since then, he had been going from one doctor to another and he was diagnosed with ITP and had been under heavy medication. He was advised to give a call and see if there was anything to be done regarding the situation. His medical bills had skyrocketed and he was on Promacta which was costing thousands of dollars a year. Patient thinks he was admitted on 25Oct2021 and discharged 11 days later. He was reading from a blood report, and it does seem to indicate that it started around 08Oct2021, for presumed ITP which stands for idiopathic thrombocytopenia purpura or pathology. Most call it idiopathic thrombocytopenia. Clarifies he was admitted around the early part of Oct2021 and discharged 11 days later. Had improved, platelet blood count has gone up with treatment. The day of admission his platelet blood count was 5000 and then went down to 1000. Goes up and down. Last platelet blood test a couple of weeks ago was 122,000. Patient was taking treatment as Promacta since last year. He was taking other medication but does not think they are relevant. He had banged his hand and hand turned totally blue or purple and then went to physician for a blood test since it did not look to good and the doctor called him the same day and told him to get to emergency room immediately and he would need a steroid infusion.; Sender's Comments: Linked Report(s) : US-PFIZER INC-PV202300054223 same patient, different drug and event;