oxygen level can drop to 70; oxygen levels they transferred her into the hospital / plummeting oxygen; her heart rate started going up and within 24 hours she ended up in the hospital.; pain in the legs and muscles; pain in the legs and muscles; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP) from medical information team, Program. The reporter is the parent.  A 27-year-old female patient received BNT162b2 (BNT162B2), on 11Jan2022 as dose 2, single (Batch/Lot number: unknown) at the age of 27 years for covid-19 immunisation. The patient's relevant medical history included: "she went to rehab" (unspecified if ongoing), notes: she went to rehab; "bipolar" (unspecified if ongoing), notes: diagnosed with bipolar prior to vaccine receipt. The patient's concomitant medications were not reported. Vaccination history included: BNT162b2 (Dose: 1), administration date: 18Dec2021, for COVID-19 Immunization. The following information was reported: HEART RATE INCREASED (hospitalization) with onset Jan2022, outcome "unknown", described as "her heart rate started going up and within 24 hours she ended up in the hospital."; OXYGEN SATURATION DECREASED (hospitalization) with onset Jan2022, outcome "unknown", described as "oxygen level can drop to 70; oxygen levels they transferred her into the hospital / plummeting oxygen"; PAIN IN EXTREMITY (non-serious), MYALGIA (non-serious), outcome "unknown" and all described as "pain in the legs and muscles". The patient underwent the following laboratory tests and procedures: Heart rate: high, notes: heart rate started going up; 200, notes: heart rate started going up; Oxygen saturation: oxygen level can drop to 70.  Clinical course: Calling on behalf of his 27 year old daughter who received 2nd shot of Pfizer Covid vaccine on 11Jan2022. States within hours after receiving the shot, her heart rate started going up and within 24 hours she ended up in the hospital. She hasnt been the same since and she has no quality of life. States she cant work and tries not to go up and down the stairs as it impacts her heart rate and oxygen level. States when she does go up and down the stairs, her heart rate can go up to 200 and her oxygen level can drop to 70. Reports ongoing pain in the legs and muscles. States she went to rehab and because of their concerns with her oxygen levels they transferred her into the hospital. States she has been to several hospitals and has seen multiple specialists including pulmonary cardiology; rheumatology. They know something was wrong, but they dont know what was causing it and how to treat. They believe it was a reaction to the vaccine she received. States her daughter was diagnosed with bipolar prior to vaccine receipt. Caller was asking for recommendations re treatment and suggestions where to send her for treatment. Caller said they'd been trying to reached out to different doctors but they don't have an answer about what went wrong with his daughter. He wanted to know what treatment could be given to her. She has accelerated heart rate and plummeting oxygen, and nobody, pulmonologists and cardiologists have no answers to what's going on. Million tests, she had all kinds of things done and he feels that she's going nowhere even with the local doctor she's been all over the place. She had an appointment today with a rheumatologist and he made her feel like it's kind of a hopeless situation right now. They didn't know what to do so he decided to reach out to Pfizer since his daughter got the Pfizer vaccine, and see if there's any information that we have on anybody that's working on people like her daughter, or any treatment, or any care, or anybody that they can refer her to look in her situation.  The information on the batch/lot number for [BNT162B2], has been requested and will be submitted if and when received.