Stayed in bed for two days; Felt very sick; a very severe headache that lasted for quite a while; Fatigue; Felt very weak/weakness; She had no appetite; Severe body aches; Fever; Feels like she has flu symptoms; Tiredness; Bad chills; Desire to hydrate; I have to force myself eating/a lack of appetite; Can't drive; couldn't concentrate; couldn't function, she was so out of it; 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.  A 72 year-old female patient received bnt162b2 (BNT162B2), administration date 28Sep2021 (Lot number: FF2588) at the age of 72 years as dose 3 (booster), single for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. Vaccination history included: Bnt162b2 (First dose, Lot: EL1283, Expiry date: 30Apr2021), administration date: 19Jan2021, when the patient was 72 years old, for COVID-19 immunization, reaction(s): "Pain in her arm"; Bnt162b2 (Second dose, Lot: EL9262, Expiry date: 31May2021), administration date: 09Feb2021, when the patient was 72 years old, for COVID-19 immunization, reaction(s): "Covid arm", "weakness", "Headache", "Tired", "big red blotch". The following information was reported: BED REST (non-serious) with onset Sep2021, outcome "recovering", described as "Stayed in bed for two days"; ILLNESS (non-serious) with onset Sep2021, outcome "recovering", described as "Felt very sick"; HEADACHE (non-serious) with onset Sep2021, outcome "recovering", described as "a very severe headache that lasted for quite a while"; FATIGUE (non-serious) with onset Sep2021, outcome "recovering", described as "Fatigue"; ASTHENIA (non-serious) with onset Sep2021, outcome "recovering", described as "Felt very weak/weakness"; DECREASED APPETITE (non-serious) with onset Sep2021, outcome "recovering", described as "She had no appetite"; PAIN (non-serious) with onset Sep2021, outcome "recovering", described as "Severe body aches"; PYREXIA (non-serious) with onset Sep2021, outcome "recovering", described as "Fever"; INFLUENZA LIKE ILLNESS (non-serious) with onset Sep2021, outcome "recovering", described as "Feels like she has flu symptoms"; FATIGUE (non-serious) with onset Sep2021, outcome "recovering", described as "Tiredness"; CHILLS (non-serious) with onset Sep2021, outcome "recovering", described as "Bad chills"; DEHYDRATION (non-serious) with onset Sep2021, outcome "recovering", described as "Desire to hydrate"; DECREASED APPETITE (non-serious) with onset Sep2021, outcome "recovering", described as "I have to force myself eating/a lack of appetite"; MOVEMENT DISORDER (non-serious) with onset Sep2021, outcome "recovering", described as "Can't drive"; DISTURBANCE IN ATTENTION (non-serious) with onset Sep2021, outcome "recovering", described as "couldn't concentrate"; OCCUPATIONAL PROBLEM ENVIRONMENTAL (non-serious) with onset Sep2021, outcome "recovering", described as "couldn't function, she was so out of it". Relevant laboratory tests and procedures are available in the appropriate section. Therapeutic measures were taken as a result of headache.  Additional information: She had a very severe headache that lasted for quite a while, but she took a Tylenol and it seemed to subside. She mentioned she did not start any new medications within the 2 weeks leading up to her systems. She did have a slight fall 2 weeks before the booster shot. She stated that her X-rays and everything was fine. She was on pain medications about 2 weeks before the booster shot but she stopped it, she only took it a couple of days, and was not taking the pain medications when she got the booster shot. She clarified she stopped the pain mediation 2 weeks before the booster shot so it was way out of her system when she got the booster shot.   Follow-up attempts are completed. No further information is expected.