checking for blood clot; under arm is so red and hot; swollen glands under armpit, cannot lift or move arm; swollen glands under armpit, cannot lift or move arm; she started to feeling a lot of pain in her left arm; pain, swelling from neck to shoulder; pain, swelling from neck to shoulder; pain, swelling from neck to shoulder; pain, swelling from neck to shoulder; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP), Program ID: (159558). The reporter is the patient.  A 51-year-old female patient received BNT162b2 (BNT162B2), on 23Dec2021 as dose 3 (booster), single (Lot number: FJ1620) at the age of 51 years, in left arm for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: BNT162b2 (DOSE 1, SINGLE, LOT - EL0140), administration date: 30Dec2020, when the patient was 50-year-old, for COVID-19 immunization; BNT162b2 (DOSE 2, SINGLE, LOT- EL3302), administration date: 20Jan2021, when the patient was 50-year-old, for COVID-19 immunization. The following information was reported: ARTHRALGIA (non-serious), NECK PAIN (non-serious), SWELLING (non-serious), PAIN (non-serious) all with onset 23Dec2021, outcome "not recovered" and all described as "pain, swelling from neck to shoulder"; PAIN IN EXTREMITY (non-serious) with onset 23Dec2021, outcome "not recovered", described as "she started to feeling a lot of pain in her left arm"; JOINT RANGE OF MOTION DECREASED (non-serious), LYMPHADENOPATHY (non-serious) all with onset 28Dec2021, outcome "not recovered" and all described as "swollen glands under armpit, cannot lift or move arm"; THROMBOSIS (medically significant), outcome "unknown", described as "checking for blood clot"; ERYTHEMA (non-serious), outcome "unknown", described as "under arm is so red and hot". The events "checking for blood clot", "she started to feeling a lot of pain in her left arm", "pain, swelling from neck to shoulder" and "swollen glands under armpit, cannot lift or move arm" required physician office visit and emergency room visit. The patient underwent the following laboratory tests and procedures: Computerised tomogram: Unknown results, notes: they saw something, inconclusive, was checking for blood clot; Ultrasound scan: Unknown results, notes: they saw something, inconclusive, was checking for blood clot. Therapeutic measures were taken as a result of pain in extremity, arthralgia, neck pain, swelling, pain, joint range of motion decreased, lymphadenopathy.  Additional information: Caller states she got first and second dose with no symptoms. Caller clarifies after she got her third dose on 23Dec2021 and she mentioned she had a reaction and is now calling to report it, the booster, she started to feeling a lot of pain in her left arm. On 28Dec2021 she checked her neck and form her neck to her shoulder on her left side was completely swollen, under arm pit is swelling as well, cannot lift or move her arm, doctor told her to go directly to ER, glands were totally inflamed. Did an ultrasound and CT, and checked and everything is um, they saw something, inconclusive, was checking for blood clot but the doctor said that is from the Covid vaccine. Gave her some medicine, something for inflammation and pain. Since that she continues feeling the same symptoms.  She is at home because she cannot lift or close her arm, glands and neck are swelling. under arm is so red and hot Lost many days of her days and cannot lose her job. Went to her doctor about 2 weeks ago because she cannot move her arm, told her that this issue is because of the vaccine, has to see orthopedic, arms are not as strong as they were before