Vomiting; Other gastrointestinal symptoms, loose stool, diarrhea, constipation; Other gastrointestinal symptoms, loose stool, diarrhea, constipation/It goes from constipation to intermittent loose stool for the the last 2-3 weeks; She went to the hospital for vomiting and dehydration; before she got sick she was 135 and now she is 124; before she got sick she was 135 and now she is 124; Nauseous since one month after receiving the second shot; This is a spontaneous report received from a Pfizer sponsored program via a contactable consumer (patient) reported for herself. A 43-year-old female patient received second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number: unknown, Expiration date: unknown) via an unspecified route of administration, administered in upper left arm on 01Apr2021 (age at vaccination was 43 years) as 2nd dose, single for COVID-19 immunization. Medical history included ongoing celiac disease. She states that if an autoimmune disease could affect a reaction to the shot then yeah. She was diagnosed maybe 8 years ago. The patient stated that her mom and sister also had celiac disease. Concomitant medications were not reported. The patient previously received first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Solution for injection, Lot number: unknown, Expiration date: unknown) via an unspecified route of administration, administered in upper left arm on 11Mar2021 (age at vaccination was 43 years) as 1st dose, single for COVID-19 immunization and did not experience any reaction. The patient previously received Flu Shot on an unspecified date and experienced nothing beyond feeling icky after the flu shot, nothing abnormal. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. The patient did not receive any other vaccines on same date of the Pfizer suspect. The vaccine was not administered at military facility. The patient had been nauseous since she got the second shot. She got the second shot months ago. She reported that the nausea started approximately one month after the second shot and felt nauseous since one month after receiving the second shot. She thought it was in the morning. When she said she felt nauseous on 29Apr2021 that was just the date she started vomiting she actually felt nauseous a couple of days before that but she just thought it was nothing. She initially stated that nausea began on 29Apr2021 and then later clarified she was actually nauseous a couple days before that but 29Apr2021 was just when she started vomiting. She said all of it began on 29Apr2021. She stated when it first started, she was vomiting, but she hasn't been vomiting so she guessed it had improved. She stated she hasn't vomited in a few weeks, she did not know the exact date that the vomiting recovered. She mentioned she had other gastrointestinal symptoms loose stool, diarrhea, constipation. She thought in the afternoon, she started vomiting in the afternoon. That was when all of the symptoms besides the nausea had started. She stated it had changed. It went from constipation to intermittent loose stool for the last 2-3 weeks. It had gotten better since the diarrhea, but since it improved it has held at the same level. Everything had been off since 29Apr2021 to some degree. The nausea was just the main one. She stated before she got sick she was 135 and now she is 124. She confirmed she had called about the COVID vaccine. She asked if other people had reported that or if there was a way to find out. When asked about the lot number she stated that she thought it was the beginning said Pfizer could it be TR, but she was not confident about that or maybe she didn't know. That was the lot for the second dose which was given on 01Apr2021. She added the letters could also be EN. It was just super messy. It was not tiny. She confirmed she was reading the lot numbers from the vaccination card. There was nothing wrong, everything was negative but she could provide everything she got tested for, if it was needed. She went to the emergency room and Physician office. She went to a primary, she got in with a random one and a gastroenterologist. She went to the hospital for vomiting and dehydration. The patient was not hospitalized. The patient did not have any relevant tests. The outcome of the events nausea, constipation, and diarrhoea was resolving. The outcome of the event vomiting was resolved on an unknown date in 2021. The outcome of the other events was unknown.  Follow up attempts are needed.