arm swelled up a little; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 69-year-old female patient received BNT162b2, BNT162b2 omi ba.4-5 (BNT162B2, BNT162B2 OMI BA.4-5), on 18Nov2022 as dose 3 (booster), single (Lot number: GJ6796, Expiration Date: 31Jul2023) at the age of 69 years intramuscular, in left arm for covid-19 immunisation. The patient had no relevant medical history. Concomitant medication(s) included: INFLUENZA VACCINE, in Nov2022 as dose number unknown, single. Vaccination history included: Janssen covid-19 vaccine (DOSE 1, SINGLE), for COVID-19 immunization, reaction(s): "chills", "gotten sick", "running a fever"; Janssen covid-19 vaccine (DOSE 2, SINGLE), for COVID-19 immunization, reaction(s): "chills", "gotten sick", "running a fever". The following information was reported: VACCINATION SITE SWELLING (non-serious) with onset 18Nov2022, outcome "recovered" (18Nov2022), described as "arm swelled up a little". Therapeutic measures were taken as a result of vaccination site swelling.  Additional information: Consumer took a Pfizer shot and was worried about the reaction. This was her third shot, her second booster. She got two Johnson and Johnson vaccines and then the booster. This time they said she could change which one, and the Johnson and Johnson each time was making her so sick, so she made appointment  and they gave her a Pfizer shot, which didn't feel like a shot. She expected her arm to be really stiff, and it wasn't, but she didn't get sick or have any fever or anything. She wondered if the nurse had even given her any medication in the needle. She didn't know if she was not supposed to get sick, and was worried that she didn't get any medication with the shot. She has a couple friends who said they didn't get sick at all, and the nurse said she didn't get sick with her second shot, but she doesn't know which shot she got or anything. Her arm was not sore at no time, at the same time she got the shot her arm swelled up a little, but she worked the next day and had no headaches or anything. She wanted to know if that was sort of normal that she didn't get sick. She changed from Johnson and Johnson. Pfizer COVID-19 vaccine AE: Her arm got a little swollen so she put ice on it. She had no fever, nothing, she didn't even get sick, and she assumed from before her arm had got so stiff, but maybe she took it the wrong way. She clarifies taking it the wrong way as the nurse gave her the shot and she is not getting a reaction to it like she had gotten sick and running a fever, since she is so used to getting and chills with the regular Johnson and Johnson COVID-19 vaccines, which is why she switched to Pfizer's, so she wouldn't get deathly sick. This was her first time with Pfizer. Her arm swelling was gone that night, on the 18Nov2022, it wasn't stiff hardly.Pfizer COVID-19 vaccine: didn't feel like a shot. expected her arm to be really stiff, and it wasn't, she didn't get sick or have any fever or anything. didn't know if they really gave her the shot. wondered if the nurse had even given her any medication in the needle. is not getting a reaction to it like she had gotten sick and ran a fever and had chills with Johnson and Johnson COVID-19 vaccine.