This is a spontaneous report received from a contactable reporter (Consumer). The reporter is the patient.  A 50-year-old female patient received bnt162b2 (BNT162B2), administered in arm right, administration date 07Dec2021 at 18:35-18:40 (as reported) (Lot number: F07218) at the age of 50 years as dose 3 (booster), single for covid-19 immunisation. Vaccine was not administered in military facility and vaccination facility type was reported as pharmacy/drug store. No vaccines were administered on the same day. The patient had no relevant medical history and no family medical history relevant to events. Concomitant medication included: FLU taken for immunisation, administration date 28Nov2021. Vaccination history included: BNT162b2 (Dose 1, Lot: ER2613), administration date: 18Mar2021, for COVID-19 Immunization, reactions: "feel like a big bunch like the other 2 shots", "It wasn't like the first or second vaccine, her arm didn't hurt"; BNT162b2 (Dose 2, Lot: ER8737), administration date: 08Apr2021, for COVID-19 Immunization, reactions: "feel like a big bunch like the other 2 shots", "It wasn't like the first or second vaccine, her arm didn't hurt". No other events following priori vaccinations were reported. The following information was reported: IMMUNISATION (non-serious) with onset 07Dec2021, outcome "unknown", described as "Booster"; GASTROINTESTINAL INFLAMMATION (non-serious), ABDOMINAL PAIN (non-serious) all with onset 08Dec2021, outcome "not recovered" and all described as "Sides were sore from her intestines being inflamed"; DIZZINESS (non-serious) with onset 08Dec2021, outcome "recovering", described as "Dizzy"; CHILLS (non-serious) with onset 08Dec2021, outcome "recovered" (10Dec2021), described as "Shivering"; HEADACHE (non-serious) with onset 08Dec2021, outcome "recovered" (10Dec2021), described as "Headache"; PAIN (non-serious) with onset 08Dec2021, outcome "recovered" (10Dec2021), described as "Body ache"; PYREXIA (non-serious) with onset 08Dec2021, outcome "recovered" (10Dec2021), described as "Fever"; BACK PAIN (non-serious) with onset 08Dec2021, outcome "recovering", described as "Back hurts". Events onset time was reported as 14:00-15:00. The events did not require visit to emergency room and physician office. Therapeutic measures were taken as a result of gastrointestinal inflammation, dizziness, chills, headache, pain, pyrexia, abdominal pain, back pain, and included paracetamol (TYLENOL). The patient had not undergone any relevant tests.  Additional information: Caller (patient) stated it was weird because she didn't see the person administering the vaccine with the bottle in her hand when she wrote down the ID number of the vaccine. Caller stated when she gave her the booster shot, it was very little liquid, only an inch worth of booster and it wasn't like the first or second vaccine, her arm didn't hurt and it didn't feel like a big bunch like the other 2 shots. Caller stated on Wednesday afternoon (08Dec2021), she felt dizzy, had shivering, headache, body ache, and full blown COVID symptoms, fever, and her sides were sore from her intestines being inflamed and her back hurts, she asked if this was normal.; Sender's Comments: Linked Report(s) : US-PFIZER INC-202101772804 same reporter/patient, different dose/event