The pain has gotten so bad in the caller's arm its all the way down to her hand and up to her neck and moved to her shoulder and the upper neck area, it is severe pain; The pain has gotten so bad in the caller's arm its all the way down to her hand and up to her neck and moved to her shoulder and the upper neck area, it is severe pain; she cannot sleep anymore; felt like a fireball in her arm where she got the shot; slowly she started to have some pain in her arm where she got the shot; third dose of the Pfizer covid vaccine; cannot lift up her anymore; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient. Other Case identifier(s): US-PFIZER INC-202200035998 (Pfizer).  A 72 year-old female patient received bnt162b2 (BNT162B2), administration date 29Sep2021 (Batch/Lot number: unknown) as dose 3 (booster), single for covid-19 immunisation. The patient's relevant medical history and concomitant medications were not reported. Vaccination history included: Covid-19 vaccine (Dose: 2, Primary Immunization series complete but unknown manufacturer), for Covid-19 immunization; Covid-19 vaccine (Dose: 1, Primary Immunization series complete but unknown manufacturer), for COVID-19 immunization. The following information was reported: IMMUNISATION (non-serious) with onset 29Sep2021, outcome "unknown", described as "third dose of the Pfizer covid vaccine"; PAIN IN EXTREMITY (non-serious) with onset Nov2021, outcome "not recovered", described as "slowly she started to have some pain in her arm where she got the shot"; NECK PAIN (non-serious), ARTHRALGIA (non-serious) all with onset Dec2021, outcome "not recovered" and all described as "The pain has gotten so bad in the caller's arm its all the way down to her hand and up to her neck and moved to her shoulder and the upper neck area, it is severe pain"; JOINT RANGE OF MOTION DECREASED (non-serious) with onset 2021, outcome "unknown", described as "cannot lift up her anymore"; INSOMNIA (non-serious) with onset Dec2021, outcome "unknown", described as "she cannot sleep anymore"; FEELING ABNORMAL (non-serious) with onset Dec2021, outcome "unknown", described as "felt like a fireball in her arm where she got the shot". The events "slowly she started to have some pain in her arm where she got the shot", "the pain has gotten so bad in the caller's arm its all the way down to her hand and up to her neck and moved to her shoulder and the upper neck area, it is severe pain", "the pain has gotten so bad in the caller's arm its all the way down to her hand and up to her neck and moved to her shoulder and the upper neck area, it is severe pain", "cannot lift up her anymore", "she cannot sleep anymore" and "felt like a fireball in her arm where she got the shot" were evaluated at the physician office visit. Therapeutic measures were taken as a result of pain in extremity, neck pain, arthralgia, insomnia, feeling abnormal.Additional information: The consumer was calling about the problem in her arm after the Pfizer booster shot. She clarified that she was calling about the third dose of the Pfizer covid vaccine. She got it on 29Sep and was okay for 6 weeks and didn't feel anything or have any particular problems. Then slowly she started to have some pain in her arm where she got the shot. The pain had gotten so bad in her arm its all the way down to her hand and up to her neck and moved to her shoulder and the upper neck area, it was severe pain. It felt like a fireball in her arm where she got the shot and she cannot sleep anymore and didn't know what to do. She called her doctor and they had a wait for an appointment so she decided to call Pfizer to advise her. She cannot lift up her anymore. This event had gotten really bad this past week. After the vaccine she had a little arm pain for a few days but didn't feel any different than the first two doses, and she felt okay. Two months after the shot she started to have pain in her arm, and its increasingly getting worse. In December for 2-3 weeks the pain had been very strong, and last week she couldn't fall asleep even with a sleeping pill. It went from the left hand up to the shoulder and neck area on the left side. She had the shot on the left side. Where she had the shot it felt like a fireball on the inside and the pain is radiating. She cannot even hold a telephone in her left hand, and its impossible for her to pick up her left arm. The pain never went away its always there. The painkiller did not help. She took two Aleve, one a day for two days but it didn't help so she tried a Bayer aspirin but that didn't help either. She didn't take any medications, she had no health conditions and was a healthy weight. Its really not a good situation for her, she literally cannot do anything anymore beside having this pain. It didn't feel warm to the touch, not from the outside but on the inside its very bad, like a fireball. She did not have a fever. The pain was worsening as time went by. She can only get a zoom call with her doctor.The lot number for bnt162b2 was not provided and will be requested during follow up.