Pain in my neck and down to my hand; Pain in my neck and down to my hand on the arm/ pain in her neck and down to her hands on the left side; Pain in her neck and down to her hands on the left side was reported as worsened.; Booster / had the booster shot; Swelling and pain in the left arm for a few days; Swelling and pain in the left arm for a few days; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 68 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 30Oct2021 22:30 (Batch/Lot number: unknown) at the age of 68 years as dose 3 (booster), single for covid-19 immunisation. The patient's relevant medical history was not reported. There were no concomitant medications. Vaccination history included: Bnt162b2 (First dose, Lot: EN6198,), administration date: 23Mar2021, when the patient was 67 years old, for COVID-19 immunization, reaction(s): "with the first shot, she got desperately ill"; Bnt162b2 (Second dose, Lot: EW0164, when she got the second dose she called the hospital and told them and they said that more than likely it was thought she had Covid), administration date: 20Apr2021, when the patient was 68 years old, for COVID-19 immunization, reaction(s): "more than likely it was thought she had Covid", "more than likely it was thought she had Covid". The following information was reported: IMMUNISATION (non-serious) with onset 30Oct2021 22:30, outcome "unknown", described as "Booster / had the booster shot"; PERIPHERAL SWELLING (non-serious), PAIN IN EXTREMITY (non-serious) all with onset 2021, outcome "recovered" (Nov2021) and all described as "Swelling and pain in the left arm for a few days"; NECK PAIN (non-serious) with onset Dec2021, outcome "not recovered", described as "Pain in my neck and down to my hand"; PAIN IN EXTREMITY (non-serious) with onset Dec2021, outcome "not recovered", described as "Pain in my neck and down to my hand on the arm/ pain in her neck and down to her hands on the left side"; CONDITION AGGRAVATED (non-serious) with onset Dec2021, outcome "not recovered", described as "Pain in her neck and down to her hands on the left side was reported as worsened.". Therapeutic measures were taken as a result of neck pain, pain in extremity, condition aggravated.  Additional Information: The patient medical history was reported as no. Investigation assessment was reported as no. No additional vaccines administered on same date of the Pfizer vaccine. No prior vaccinations (within 4 weeks). It was reported that the patient had the booster shot and had some complications. She received it in her left arm in October. She initially had some swelling and pain in the left arm for a few days, then it went away (duration of event was reported as 304 days). Now she was experiencing that same "pain in my neck and down to my hands" on the left side. No specific information was reported about a side effect resolving, then reoccurring and changing. Pain in her neck and down to her hands on the left side last part of last week. The events did not result into emergency room or physician office visit. She was calling because she had same pain as when she got the shot but more intense and it travelled down her arm, it was almost the exact same pain. The patient asked that could it cause pain in her neck and down to her hand on the arm she got the shot in weeks after receiving the booster dose. Relevant tests were none. The patient had not talked to the doctor yet, she would call if it got worse. She had pain medication she had been taking for this event. The doctor would probably tell her to call the place she got the shot since she did not get it with her doctor's office. The patient confirmed that she was not tested for COVID; she never had a positive test for COVID.  The lot number for bnt162b2 was not provided and will be requested during follow up.