They went to the hospital this morning and she had high blood pressure; right side of her neck, her veins are swell; the right side of her neck, her veins are swell and sore; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. A 51-year-old female patient received BNT162b2 (BNT162B2), on 21May2022 at 11:00 as dose 4 (booster), single (Batch/Lot number: unknown) for covid-19 immunization. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Bnt162b2 (1st Booster, had gotten her last booster Aug2021 of last year.), administration date: Aug2021, for Covid-19 immunization; Covid-19 vaccine (Second dose manufacturer unknown), for Covid-19 immunization; Covid-19 vaccine (First dose manufacturer unknown), for Covid-19 immunization. The following information was reported: THROMBOPHLEBITIS (hospitalization) with onset 22May2022, outcome "unknown", described as "right side of her neck, her veins are swell"; NECK PAIN (hospitalization) with onset 22May2022, outcome "unknown", described as "the right side of her neck, her veins are swell and sore"; HYPERTENSION (hospitalization) with onset 23May2022, outcome "unknown", described as "They went to the hospital this morning and she had high blood pressure". The patient was hospitalized for thrombophlebitis, neck pain, hypertension (start date: 23May2022). The patient underwent the following laboratory tests and procedures: Blood pressure measurement: (23May2022) too high; Blood test: (unspecified date) Unknown results; Electrocardiogram: (unspecified date) Good, notes: said that was doing good; X-ray: (unspecified date) Unknown results. Clinical course: Upon follow up on 23May2022, reported that Caller states he was calling for his fiance, regarding the Pfizer second booster. His fiance just got the second booster and had gotten her last booster Aug2021 of last year. When patient went to her second booster, that was Saturday morning at 11:00am. Last night, it started getting on the right side of her neck, the veins were swelling a little bit and patient was getting pain there. was this a real reaction? Caller states that his fiance went to the hospital this morning and they said her blood pressure was too high. They did an EKG and said that was doing good. They are also doing X-rays and now, blood tests. Clarified that the caller was referring to the Pfizer second booster for the Corona virus, the Pfizer second Covid booster. Caller states he wanted to find out if this was all right and if this was normal. He spoke to a Nurse Practitioner that he knows, who said that it was probably a reaction from the vaccine, causing the muscles in the lymph nodes to swell. Why they are affected, he does not know, he only knows this lady from the neighborhood. Reporter Details:Caller asks why all of this information, like his address was important for this. He was advised that this information would be used for follow up purposes. Caller asks, how long this will take, stating he was worried about her and requesting to have his questions addressed. Clarified that the patient was still at the hospital now and caller states that she went to urgent care first but, they told her to go to the hospital. Unable to clarify if the patient has been admitted to the hospital, as when the caller was asked, he states that right now patient having pain in the right side of her neck. He states it showing her veins like they could see them there and are very painful. Her blood pressure was really high. No further details were provided and caller was transferred to another line to address his question.  The information on the batch/lot number for BNT162b2 has been requested and will be submitted if and when received.