I have abnormal heartbeat it goes high 220 and it goes low, it can go lower like 47 or 50 but I am not taking any medication."; little out of breath; stomach infection; Cramps with Diarrhea; Cramps with Diarrhea; This is a spontaneous report from a contactable consumer (patient) via Medical Information Team. A 63-years-old female patient received bnt162b2 (PFIZER-BIONTECH COVID-19 mRNA VACCINE, Formulation: Solution for injection, Lot number: EW0217), via an unspecified route of administration on 07Jul2021 (at the age of 63-years-old) as a dose 1, single for COVID-19 immunization. The patient's medical history included allergic slightly, itchy mouth (she was allergic slightly, she gets an itchy mouth after she has certain tropical fruits like kiwi and watermelon. The patient stated that, sometimes she also gets the same reaction to very ripe bananas or the skin of an apple), osteoporosis, uterine hyperplasia, acid reflux, irritable bowel syndrome, heartburn, (patient takes tums antacid), asthma, (patient uses Asthma Pump, sometimes when having trouble with weather allergy), on an unspecified date in Oct2020, biopsy (patient had seen a Gynaecologist on an unspecified date in Oct2020 before the Covid Vaccine, patient didn't remember the day of the month (October) but they gave me a biopsy and they wanted to do a little surgery BNC (further not clarified) but they were waiting for the vaccines to come) and allergy. The patient's concomitant medications included vitamin b [vitamin b nos], vitamin d [vitamin d nos], calcium and calcium carbonate, magnesium carbonate (TUMS [CALCIUM CARBONATE; MAGNESIUM CARBONATE]), taken for heartburn. On an unspecified date in 2021, the patient experienced her heartbeat went up after taking the first dose and diarrhea for a couple of days. It was reported that patient had cramps with diarrhea on Friday and yesterday that was improved but she also had some issues with her stomach infection. Stated that, she didn't know that was 2 weeks after the shot, she didn't know if it was connected to the shot (vaccine). Stated that, her heart was going faster like around 3 hours or within less than 3 hours after the shot but then it got better by itself. Stated that, she didn't call the doctor. Stated that, she had a question if she didn't get a serious allergic reaction to the first shot, would she get an allergic reaction to the second shot. The patient stated that, she had abnormal heartbeat it went high 220 and it went low, and also stated that it can go lower like 47 or 50 but she was not taking any medication. The patient mentioned that she was scheduled to get her second dose and she was a little worried. She stated that she wanted to know that whether there might be a severe allergic reaction to the second dose if she didn't get one from the first dose or was it less likely. Patient reported that around three hours after she got the first shot her heart beat became heavy. Stated that, she sat down and she didn't know if one would call it racing but she was checking it and it was up to like 115-120 for a while, maybe a couple of hours it stayed around there. Stated that, she was just resting, she was either sitting or half-lying and it was going like that and then it fully resolved itself after a while. Then over the next couple of days it was elevated but not as bad and then it went back to its normal speed. During all that time she stated, she was still able to do things but she was feeling a little out of breath as if she was exercising but she wasn't. She stated that, she didn't call the doctor about it and it went away but she also had that before she took the vaccine so she wasn't sure. She stated that, she talked to a nurse because she didn't have a doctor and the nurse stated that, it might have been because she was out in the sun and she hadn't had anything to eat or drink in 4 hours around getting the shot because things got complicated. Stated that, the nurse wasn't sure whether it was an after effect of that being a bit dehydrated. Stated that, after she drank and was sitting for a while she got better. She was wondering if that reaction would happen with the second shot or could that reaction be worse with the second shot. Stated that, it did resolve itself. She wanted to know whether the ingredients in erythromycin which gave her a fast heart beat so they stopped giving it to her as an antibiotic and wanted to know if any of those ingredients are in the Pfizer COVID-19 vaccine. She stated that, she looked at the ingredients for the Pfizer COVID vaccine but she couldn't tell if it had any of the same ingredients and if that's the case then maybe that was why her heart rate went up. She was talking about a reaction to the ingredients to the Pfizer vaccine would have happened to the first shot rather than the second or wanted to know if it would be an accumulation or if would get a severe reaction to the second dose adding to the first. Stated that, she was trying to reassure herself because she was sort of scared of getting a severe reaction. She stated that she didn't understand when she was reading on the site they were breaking down the cases 17 of 21 patients that had anaphylaxis some of them had had reactions in the past to medicine, medical products, food, or insect stings. She was just wondering since she didn't get an anaphylactic reaction to fruits, she just breaks out to a rash in her mouth in the back and the top and then it went away over time, if that meant since they mentioned fruit and she got some allergies as long as her food allergies were not that severe probably her food allergies would be similar because obviously and there were not the same ingredients in fruit, besides maybe potassium she was not sure as in the Pfizer vaccine so it doesn't make since to her that people with fruit allergies have gotten an anaphylactic reaction but she never had it from fruit she just had the itchy mouth. So she guessed that meant she only has mild allergies and also because she didn't get any kind of itchiness in her mouth from the vaccine it probably wouldn't happen again. Patient wanted to know whether the symptoms she had from the 1st vaccine will be worse on the second vaccine. It was reported that the missed the second dose on 28Jul2021. On an unspecified date in 2021, the patient underwent lab tests and procedures which included heartbeat, resulted as 115-120 and heartbeat, resulted as high 220 and it goes low, it can go lower like 47, have abnormal heartbeat it goes high 220 and it goes low, it can go lower like 47 or 50. The outcome of the events for cramps with diarrhea was recovering, for infection was unknown while for the other events was recovered on an unspecified date in 2021.