Congestion; Coughing, described as initially so bad he was collapsing, now a hacking and rattling cough; Fever; Body aches; Diarrhea; stomach pain/Diarrhea, with stomach cramping; Nausea; lack of appetite; Fatigue; Fatigue, kept falling asleep; This is a spontaneous report from a contactable consumer (Patient's mother). A 16-years-old male patient received first dose BNT162B2 (BNT162B2, solution for injection, Batch/Lot Number: EW0171), via an unspecified route of administration, administered in Arm Right on 29Apr2021 09:30 (at the age of 16-year-old) as dose 1, single for covid-19 immunisation. Medical history included migraine from Jul2018 and ongoing, irritable bowel syndrome from Jul2018 and ongoing. Irritable bowel syndrome is constipation, not diarrhea. Concomitant medications included rizatriptan taken for migraine from Jul2018 and ongoing. Patient did not took any other vaccines within 4 weeks, prior covid-19 immunisation. No adverse events following prior vaccinations. On 29Apr2021, the patient experienced congestion, coughing, described as initially so bad he was collapsing, now a hacking and rattling cough, fever, body aches, stomach pain, diarrhea, with stomach cramping, nausea, lack of appetite, fatigue, kept falling asleep. It was reported that caller states he may have inherited this from her. Caller states that (patient) her son had a bad 2018, as they were trying to figure out what was going on with him, medically. Patient had a colonoscopy and endoscopy and Patient was diagnosed with migraines and irritable bowel syndrome at that time. Caller states his issue with irritable bowel syndrome is constipation, not diarrhea. Caller states that she and her son had the Pfizer Covid shot. Caller states that she and her son, had the vaccine, last Thursday, recaptured later in report as 29Apr2021.Caller states her symptoms were not that bad, and reports she still has diarrhea. Caller states that her son, 3 hours after the vaccine, had, reclarified, congestion, cough, fever, body aches, stomach pain, nausea, diarrhea, and fatigue, where he kept falling asleep. Caller reports that her son is 16 years old. Caller states that some of the effects have gone down, but the stomach pain and diarrhea have remained. caller states that because of her son's symptoms, he was tested for the Covid virus, specifically because his cough got so bad, that he was almost collapsing. Caller states he was tested for Covid on Monday, and his test was negative. The main reason she is calling is to get an answer about his symptoms. Caller states that she really can't get an answer from his doctor, as he instructed the Caller if her son's symptoms got bad, to take him to the emergency room. Now mostly his stomach pain and diarrhea remain. Caller states she started giving her son Imodium. Reclarified, Caller asks are there any suggestions for treatment of his diarrhea and stomach pain. Caller asks, how long will they last as it has been over 7 days. Caller states she has been on the internet researching this question. Caller states the doctor recommended giving her son the medication, Imodium,  and if in 10 days, it is not resolved, then the doctor will recommend another treatment or further testing for her son. Caller states it is hard to find information online. Caller states her son's Paediatrician is at a loss. Caller agrees to continue a safety report for her son. Cough outcome caller answers as improved, but adds he was coughing so bad that he was collapsing. Caller states the cough is now just a hacking, rattling cough. Time around 11am, fever at noon caller states, Body aches ends caller states roughly on Saturday 01May2021 around noon, stomach pain around noon caller answers as kind of persisting, reclarified as he has spikes of the pain being worse, then it settles down like in the beginning, with moderate pain. Nausea caller states around 11 am, and the nausea came before the stomach pain. caller adds that because of the nausea, her son complains of a lack of appetite, and it came on because of the nausea, and that lack of appetite is still present. Diarrhea caller states at noon, and the diarrhea happened when his stomach started cramping. Caller clarifies that her son started taking the Imodium yesterday, and initially had no results yesterday. Caller reports that today his diarrhea is not as bad, as it was yesterday and Fatigue, kept falling asleep Caller states her son is still sleeping a lot and tired. caller reports probably around noon, and for the first 3 days after the vaccine, he slept, Caller reports he is improved, but still tired, not falling down tired. Investigation included Caller states that he was showing signs of Covid after the first vaccine and she wanted to make sure he did not have the Covid virus. No History of all previous immunization with the Pfizer vaccine considered as suspect (or patient age at first and subsequent immunizations if dates of birth or immunizations are not available). Patient did not visited emergency room and physician room, Caller reports that she has called her son's doctor, but did not actually see him in person. Caller states that there have been 3 or 4 calls back and forth, between herself and the doctor. Caller notified that Medical Information and/or Pfizer is unable to provide medical advice but may have resources to help answer some questions. Caller verbalized understanding. Second call notification was given as Caller was on speakerphone getting information from her Son, for his report. The patient underwent lab tests and procedures which included sars-cov-1 test: negative on 03May2021, endoscopy, colonoscopy. Therapeutic measures were taken as a result of diarrhea included imodium. The outcome of the events congestion, coughing, described as initially so bad he was collapsing, now a hacking and rattling cough, fatigue, kept falling asleep were recovering, nausea, lack of appetite were recovered with sequel on 01May2021, fever was recovered on 03May2021, body aches was recovered on an unknown date in 2021, diarrhea with stomach cramping was not recovered, and the outcome of the event stomach pain was unknown.   No follow-up attempts are needed. No further information is expected.