Then about 17:00 she started to have diarrhea and it was explosive for three hours; Light-headed; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP). The reporter is the patient.  A 56 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 23Jun2021 10:45 (Lot number: EW0173) at the age of 56 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Cardiac Patient" (ongoing), notes: First event was 4-5 years ago. People like to have mile stones she does not; "Lung patient" (ongoing), notes: She has been a lung patient a long time. Stated she has COPD; "COVID-19", start date: Nov2020 (unspecified if ongoing), notes: Commented she had it the end of November.; "COPD" (unspecified if ongoing), notes: She has been a lung patient a long time.; "Thyroid replacement" (unspecified if ongoing); "Blood Pressure" (unspecified if ongoing), notes: takes two high blood pressure medications, and medication for the heart; "Heart disorder" (unspecified if ongoing); "crabby" (unspecified if ongoing). Concomitant medication(s) included: LEVOTHYROXINE taken for thyroidectomy (ongoing). Vaccination history included: Shingles shot (She commented she felt more sick after the Shingles shot except for the diarrhea.), for Immunization, reaction(s): "Sick". The following information was reported: DIZZINESS (non-serious) with onset 23Jun2021, outcome "recovered" (Jun2021), described as "Light-headed"; DIARRHOEA (non-serious) with onset 23Jun2021 17:00, outcome "recovered" (23Jun2021), described as "Then about 17:00 she started to have diarrhea and it was explosive for three hours". Relevant laboratory tests and procedures are available in the appropriate section.  Additional information: She clarified her post symptoms as after getting the shot , earlier in the day yesterday she was a little light-headed. It was more light-headedness if she bent down and stood up. Then about 1700 she started to have diarrhea and it was explosive for three hours. She stated she even called US Direct because she was going to the bathroom every time she stood up. After about three hours it stopped. She commented she felt more sick after the Shingles shot except for the diarrhea. It was for a couple of hours. It went away yesterday. She was able to sleep through the night and did not get up. She confirmed she no longer feels this way. She commented she woke-up without feeling light-headed. She was unable to clarify or provide additional details regarding end-date/outcome. She commented she had COVID the end of November. She also mentioned she was on a beta blocker, takes two high blood pressure medications, and medication for the heart. Attempted to capture the names of these medications. She commented she has the actual names written down on paperwork to take to the doctor's office for visits. Otherwise, she does not worry about it. She has been on them so long and they have been working. No additional details provided. History of all previous immunization with the Pfizer vaccine considered as suspect: None, this was the first dose. No any additional vaccines administered on same date of the Pfizer suspect.  No follow-up attempts are possible. No further information is expected.