mild heart pain; I took my pulse on an oximeter and it said my pulse was only 44-48bpm; feeling very achy and fatigued; feeling very achy and fatigued; joint pain; booster; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 62 year-old female patient (not pregnant) received bnt162b2 (BNT162B2), administered in arm left, administration date 19Nov2021 15:15 (Lot number: FG3527) at the age of 62 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Left side of thyroid was removed, due to a noncancerous nodule." (unspecified if ongoing); "Arthritis in my knees" (unspecified if ongoing), notes: otherwise, generally healthy for my age.; "exercise induced asthma" (unspecified if ongoing), notes: otherwise, generally healthy for my age. Concomitant medication(s) included: SYNTHROID; ZOLPIDEM; AMITRIPTYLINE; ZYRTEC [CETIRIZINE HYDROCHLORIDE]. Past drug history included: Protonix, reaction(s): "Allergy". Vaccination history included: Bnt162b2 (Dose Number: 2, Batch/Lot No: ER8732, Location of injection: Arm Left, Vaccine Administration Time: 06:30 PM), administration date: 29Mar2021, when the patient was 62 years old, for COVID-19 immunization; Bnt162b2 (Dose Number: 1, Batch/Lot No: EN6205, Location of injection: Arm Right, Vaccine Administration Time: 08:00 PM), administration date: 08Mar2021, when the patient was 62 years old, for COVID-19 immunization. The following information was reported: IMMUNISATION (medically significant) with onset 19Nov2021, outcome "unknown", described as "booster"; ANGINA PECTORIS (medically significant) with onset 20Nov2021 17:00, outcome "recovered" (24Nov2021), described as "mild heart pain"; HEART RATE DECREASED (medically significant) with onset 20Nov2021 17:00, outcome "recovered" (24Nov2021), described as "I took my pulse on an oximeter and it said my pulse was only 44-48bpm"; PAIN (non-serious), FATIGUE (non-serious) all with onset 20Nov2021 17:00, outcome "recovered" (24Nov2021) and all described as "feeling very achy and fatigued"; ARTHRALGIA (non-serious) with onset 20Nov2021 17:00, outcome "recovered" (24Nov2021), described as "joint pain". The patient underwent the following laboratory tests and procedures: heart rate: 44-48 bpm, notes: Slow; 67 bpm, notes: midnight; 68-75, notes: usually resting heart rate. Therapeutic measures were not taken as a result of immunisation, angina pectoris, heart rate decreased, pain, fatigue, arthralgia. Clinical course: facility type vaccine: Other. No other vaccine in four weeks. Adverse event: I woke up the day following the vaccination feeling very achy and fatigued for most of the day. Later that afternoon, the joint pain and achy feeling subsided, but I noticed my heart rate seemed very slow. I took my pulse on an oximeter and it said my pulse was only 44-48bpm, where usually my resting heart rate is about 68-75. I checked my heart rate on different devices, and they all were indicating that my heart rate was between 44-48bpm. I had debated going to the hospital, but I didn't. I went to sleep around 10:00pm that night with still a low heart rate. I woke up around midnight and took my heart rate on the oximeter at that point and my heart rate was back to 67. The next couple of days I still had a very very mild heart pain, but by 24Nov, I felt pretty normal and resumed all of my normal activities. Covid not tested post vaccination.