Have a lot of mucous from nostrils /developing mucous/runny nose; Sore arm; Booster dose; She says she didn't get a headache at any time, but she was coughing and had a runny nose and a lot of mucus in her chest; sick; Severe flu like symptoms; This is a spontaneous report received from contactable reporter(s) (Other HCP) from medical information team. The reporter is the patient.  A 82 year-old female patient received bnt162b2 (COMIRNATY), administered in arm right, administration date 09Nov2021 (Lot number: FH8028) at the age of 82 years as dose 3 (booster), single for covid-19 immunisation. Relevant medical history included: "Flu" (unspecified if ongoing), notes: She did catch it before and developed mucus before.; "Mucus" (unspecified if ongoing), notes: She did catch it before and developed mucus before. Concomitant medication(s) included: FLU taken for immunisation, administration date Oct2021. Vaccination history included: Bnt162b2 (Dose 1, Lot number: EN6203, Anatomical location: Right arm), administration date: 11Mar2021, when the patient was 81 years old, for COVID-19 immunization, reaction(s): "Sore arm"; Bnt162b2 (Dose 2, Lot number: ER8737), administration date: 01Apr2021, when the patient was 82 years old, for COVID-19 immunization, reaction(s): "Sore arm". The following information was reported: IMMUNISATION (non-serious) with onset 09Nov2021, outcome "unknown", described as "Booster dose"; RHINORRHOEA (non-serious) with onset 20Nov2021, outcome "unknown", described as "Have a lot of mucous from nostrils /developing mucous/runny nose"; INFLUENZA LIKE ILLNESS (non-serious) with onset Nov2021, outcome "unknown", described as "Severe flu like symptoms"; PAIN IN EXTREMITY (non-serious) with onset 09Nov2021, outcome "unknown", described as "Sore arm"; COUGH (non-serious) with onset Nov2021, outcome "unknown", described as "She says she didn't get a headache at any time, but she was coughing and had a runny nose and a lot of mucus in her chest"; ILLNESS (non-serious) with onset Nov2021, outcome "recovered" (2021), described as "sick". Therapeutic measures were taken as a result of rhinorrhoea, influenza like illness, cough, illness. Therapeutic measures were not taken as a result of pain in extremity.  Additional information: The patient didn't have any underlying conditions like most people who have heart problems or diabetes, nothing like that. The patient takes her flu shot every year between Sep and Oct, which she already had. She caught flu like symptoms. The patient got sick and she was just now getting over being sick and she was just now feeling better. The patient had been getting a lot of mucus from her nostrils and couldn't figure out what was going on. She said she didn't know if that was one of the side effects or if the booster dose was more stronger. She said she never experienced real severe side effects like she had with the booster, so she was wondering if it was stronger than the first two that she took. She clarified for all three it hurt but not long maybe about three days each time. She was having a lot of mucus so she got some Mucinex which helped loosen up the mucus in her chest area, but it was not that effective as she thought it would be. She said she did catch it before and developed mucus before but it was not severe like with the booster. She got her flu shot back in October. She never had the mucus like that before except when she had the flu, which she doesn't have often because she always takes the flu shot before flu season between September and October.. She asked if the booster dose was a lot stronger than the other 2 shots that she took. She received the response stating that the Comirnaty or Pfizer-BioNTech COVID-19 Vaccine booster dose is the same Comirnaty or Pfizer-BioNTech COVID-19 Vaccine that was used for the primary series of Comirnaty or Pfizer-BioNTech COVID-19 Vaccine. These may not be all the possible side effects of the vaccine. Serious and unexpected side effects may occur. The possible side effects of the vaccine are still being studied in clinical trials. 1. There was a Product complaint.  No follow-up attempts are possible. No further information is expected.