Headache (4/18).; In summary, bed all day 4/17 & 4/18 feeling tremendously ill, completely unable to do anything; In summary, bed all day 4/17 & 4/18 feeling tremendously ill, completely unable to do anything; Fatigue (4/17 & 4/18); Sporadic sharp pain behind right rib (4/17 & 4/18); Lack of appetite (4/17 & 4/18); Diarrhea - evening of 4/15 and during day 4/17; Chills (4/17 & 4/18) - severe, could not warm up despite layers of clothing, comforters, and heat pad. then would be extremely hot. Back and forth; Nausea (4/17 and 4/18)- severe; Stomach cramps (severe 4/17 and 4/18, mild 4/19) - sporadic stomach cramps on dates specified. Diminished significantly but ongoing, increaseswith movement; This is a spontaneous report from a contactable consumer, the patient. A 34-year-old non-pregnant female patient received the first dose of BNT162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE; Lot Number: EW0158) via an unspecified route of administration in the right arm on 15Apr2021 at 09:15 (at the age of 34-years-old) as a single dose for COVID-19 immunisation. Medical history included migraines and interstitial cystitis and irritable bowel syndrome (IBS).  Prior to the vaccination, the patient was not diagnosed with COVID-19. The patient did not receive any other vaccines within four weeks prior to the vaccination. Concomitant medications included sumatriptan (MANUFACTURER UNKNOWN) and ibuprofen (MANUFACTURER UNKNOWN); for unknown indication from an unknown date and unknown if ongoing. On 15Apr2021, evening the patient experienced diarrhea and during day of 17Apr2021. On 15Apr2021, the patient experienced chills (on 17Apr2021 and 18Apr2021)- severe, could not warm up despite layers of clothing, comforters, and heat pad. Then would be extremely hot, back and forth. On 15Apr2021, the patient experienced nausea and on 17Apr2021 and 18Apr2021 it was severe. The patient had severe stomach cramps on 17Apr2021 and 18Apr2021. On 19Apr2021, the patient had mild stomach cramps. The patient had sporadic stomach cramps on dates specified, diminished significantly but ongoing and increased with movement. On 17 Apr2021 and 18Apr2021, the patient experienced fatigue, developed sporadic sharp pain behind right rib and lack of appetite. On 18pr2021, the patient experienced headache. In summary, in bed all day on 17Apr2021 and 18Apr2021, feeling tremendously ill, completely unable to do anything. The events did not result in doctor or other healthcare professional office/clinic visit, emergency room/department or urgent care. Therapeutic measures were not taken as a result of the events. Since the vaccination, the patient had not been tested for COVID-19. The clinical outcome of the events diarrhea, chills severe, could not warm up despite layers of clothing, comforters, and heat pad. Then would be extremely hot, back and forth, nausea, severe stomach cramps, mild stomach cramps, sporadic stomach cramps on dates specified, diminished significantly but ongoing and increased with movement, fatigue, developed sporadic sharp pain behind right rib, lack of appetite, headache in bed all day, feeling tremendously ill, completely unable to do anything was recovering at the time of this report.   No follow-up attempts are needed. No further information is expected.