Acid reflux (esophageal); does not have a lot of energy; in his arms and in his legs it was burning and tingling; in his arms and in his legs it was burning and tingling; He was in a lot of pain last night and it was from his ribs; booster dose; He has gas; sick all weekend; loss of appetite; tightness in his abdominal area; couldn't get his digestive system to work; Diarrhea; had trouble with his bowels moving; Headache; has been doing a lot of burping and burped up some liquid in his throat; This is a spontaneous report from a contactable consumer(patient). A 74-year-old male patient received third dose (booster dose) of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), via an unspecified route of administration in Arm Left on 15Oct2021 (Lot Number: FF8839), at the age of 74-year-old, as single dose for covid-19 immunisation; The patient also received influenza vaccine (FLUZONE), via an unspecified route of administration on 04Oct2021, at the age of 74-year-old, as single dose (Batch/Lot number was not reported) for immunisation. The patient medical history and concomitant medications were not reported. The patient previously received first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE; Lot number: EN9581) on 03Feb2021 and second dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE; Lot number: EN6198) on 24Feb2021, at 73-year-old, as single dose for covid-19 immunisation. The patient stated he took the Pfizer booster shot on Friday 15Oct2021 and stayed 15 minutes and everything was fine after his booster dose. He took his flu shot on 04Oct2021 and his arm was a little sore. The flu shot hurt worse than the Covid vaccine. He said that he took a bacteria test 2 weeks ago today to see if he had bacteria in his digestive system and said that he had not received his results back yet. On Saturday morning(16Oct2021) his heart rate was like 85, but at the end of the day it went down. On an unspecified date in Oct2021, He had been sick all weekend (felt bad), a loss of appetite, tightness in his abdominal area, gas and he could not get his digestive system to work, had trouble with his bowels moving. He took Magnesium citrate and then had diarrhea. He had a headache. It will take a couple days to get back to normal. Last night (19Oct2021), he was in a lot of pain and it was from his ribs all the way down, it was like it was on fire and noticed it was in his arms and in his legs it was burning and tingling. He took a Pepcid 20mg last night and planed to call both his HCP and GI doctor. He did not feel as bad as yesterday, the acid reflux medication helped, but he still did not have a big appetite. This had happened before, food bothers him. When he was at the doctor's office his Blood Pressure was fine, the top number was fine. Tuesday morning (20Oct2021) he was having severe acid reflux (esophageal). He was going to call the doctor to see what they want to do about the acid reflux. He had been doing a lot of burping and burped up some liquid in his throat on an unspecified date in Oct2021.  He felt better this morning(20Oct2021) and did not have a lot of energy, was usually very active. He said that this could all be a combination of both vaccines. He went to see his local doctor and she did not think that the vaccine had anything to do with it. Events his arms and in his legs it was burning and tingling, tightness in his abdominal area and rib pain resulted in a physician office visit. Therapeutic measures were taken as a result of tightness in his abdominal area, his arms and in his legs it was burning and tingling, acid reflux, had trouble with his bowels moving, rib pain and couldn't get his digestive system to work, included: Pepcid per his doctor instructions and Magnesium citrate. The patient underwent lab tests and procedures which included: blood pressure was 140/78 on Oct2021; blood pressure was fine, the top number was fine on Oct2021; heart rate: 85 on 16Oct2021; heart rate: 66 on Oct2021; bacterial test: unknown results on Oct2021. The outcome of events burping and burped up some liquid in his throat was recovering. The outcome of event acid reflux was not recovered. The outcome of event had trouble with his bowels moving, tightness in his abdominal area was recovered in Oct2021. The outcome of other events was unknown.  Follow-up attempts are completed. No further information is expected.