"I" had body aches; Fever; Severe pain from my right upper back thru my lower back thru my thigh, knee and leg (all on the right side); Severe pain from my right upper back thru my lower back thru my thigh, knee and leg (all on the right side); Hard time to get up from my bed or couch and to walk; The patient received the third/booster dose of BNT162b2.; Dose 2 administered on 05May2021 and Dose 3(BOOSTER) administered on 02Nov2021; This is a spontaneous report from a contactable consumer, the patient. A 73-year-old non-pregnant female patient received third booster dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: FH8028) via an unspecified route of administration in the left arm on 02Nov2021 at 15:30 (at the age of 73-years-old) as a single dose for COVID-19 immunisation. Medical history included diabetes. The patient had no known allergies. Prior to the vaccination, the patient was not diagnosed with COVID-19. The patient received influenza vaccine (MANUFACTURER UNKNOWN) for immunisation on 01Oct2021. Concomitant medications included regular medicines (unspecified) and vitamins (unspecified) for unknown indication from an unknown date and unknown if ongoing. The patient previously received first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: ER8735) via an unspecified route of administration in the left arm on 14Apr2021 at 13:00 (at the age of 72-years-old) and second dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EW0175) via an unspecified route of administration in the left arm on 05May2021 at 13:15 (at the age of 72-years-old) as a single dose for COVID-19 immunisation. On 03Nov2021, the patient had body aches and fever and severe pain from right upper back, through the lower back, through thigh, knee and leg (all on the right side). The pain was so severe such that she had hard time to get up from the bed or couch and to walk. The patient had to hold on to the sides of the home to go to the bathroom, dining or kitchen. The pain was so terrible and horrible that the patient thought she will not be able to walk again, will need either a cane or a walker and will not be able to drive again. Further it was reported that this had never happened to her before. The patient prayed so hard because she would not want to be invalid. On 03Nov2021 (reportedly the first night), the patient placed menthol (SALONPAS) on the back of the leg and thigh. On 04Nov2021(reportedly the second night), the patient rubbed lidocaine (ASPERCREME). The patient reported that miraculously, on the third day, the pain had gone, as if nothing had happened. The pain was very little if none at all and the patient had to go to office. The events did not result in doctor or other healthcare professional office/clinic visit, and emergency room/department or urgent care. Therapeutic measures were taken as a result of body aches and fever and included two tylenol (MANUFACTURER UNKNOWN) twice. Therapeutic measures were taken as a result of severe pain from right upper back through lower back, through thigh, knee and leg (all on the right side) and included menthol (SALONPAS) application on the back of leg and thigh 03Nov2021 and on 04Nov202, lidocaine (ASPERCREME) application. Since the vaccination, the patient had not been tested for COVID-19. The clinical outcome of the events body aches, fever, severe pain from right upper back, through the lower back, through thigh, knee and leg (all on the right side) such that the she was having a hard time to get up from the bed or couch and to walk were resolving at the time of this report.