Upset stomach; Diarrhea; Headache; This is a spontaneous report from a contactable consumer or other non hcp (patient). A 75-year-old female patient received bnt162b2 (BNT162B2 PFIZER-BIONTECH COVID-19 mRNA VACCINE, solution for injection, Batch/Lot number: EL3248; Expiration Date: Apr2021), via an unspecified route of administration, in arm right on 27Jan2021 (at the age of 75-years-old) as dose 1, single for COVID-19 immunisation. The medical history of the patient included migraine from an unknown date and unknown if ongoing reporter stated childhood then it went away and came back 4 years ago, so its 2016 or 2017 she had radiation treatment on, the nerve treatment, the neuralgia, the nerve treatment but for neuralgia, for migraine she was taking injections in her leg, it is called Ajovy and she take a pill when it bothers her since it is over the counter she take Excedrin Migraine, neuralgia in left jaw from an unknown date and unknown if ongoing reporter stated she had a jaw condition called, she cannot even think what it is called, she had neuralgia in her jaw, she cannot think of that medical word that is something she had forever, she had neuralgia in nerve of her left jaw. She just cannot think of the name, arthritis from an unknown date and unknown if ongoing reporter stated she cannot remember exactly because she take few medications for other conditions and they helped for arthritis (reporter was unsure) she was better. She was not been to hospital since 2008 but was diagnosed years ago before 2008 and she had not been hospitalized took two anticonvulsants one is called, can't think of the name, they have helped her arthritis and pain and neuralgia and arthritis. It is really weird. She was not bothered so much. She take anticonvulsants and was taking (incomplete sentence). They helped her other things that came on (Clarification unknown). She took them all for bipolar. Now they helped her for the neuralgia and somewhat migraine. It was because one medicine can help with several things (Further clarification was unknown), bipolar from an unknown date and unknown if ongoing and blood thinner for my heart from an unknown date and unknown if ongoing reporter stated she take baby Aspirin, blood thinner for her heart because she have a little thickening in one of her veins, in her aorta she do not know if they call it a heart condition or not, all she know was one of her artery was partially (incomplete sentence). The concomitant medications of the patient included acetylsalicylic acid (BABY ASPIRIN) taken for anticoagulant therapy, atorvastatin (LIPITOR [ATORVASTATIN]) taken for an unspecified indication, clonazepam (CLONAZEPAM) taken for an unspecified indication, fremanezumab (AJOVY [FREMANEZUMAB]) and acetylsalicylic acid, caffeine, paracetamol (EXCEDRIN MIGRAINE) taken for migraine. The reporter stated she had the first COVID injection, first shot and it was on the 27th and then she was scheduled for the second one after the 20th because of the snow. What she wondered was, she had some upset stomach since last week, it started because of she overate something and then she got diarrhea. she took lactogen, after that she have been feeling better but her stomach (incomplete sentence). It all started with the overeating of candy and then she took a neuractin (Further not clarified, hence captured as Unspecified Medication) and it made her sick. It made her, diarrhea then after that, she got better so she ate very light food so that it would not get upset stomach. It was still a little bit upset but she wondered will that stop her from getting her other shot. Her other shot was changed because of snow. It was supposed to be on the 17Feb. Should she go ahead and get her other shot. She meant, she had no fever and her taste is fine, she had a slight headache though and she also had a migraine (Later clarified as medical history) and that was normal. She stated diarrhea was gone. She had it previous day and then her stomach was better but she had no fever or anything else, the only symptom she had was stomach upset but she was better that day. She wanted to report it because she do not want to mess up. She wanted to make sure she was doing the right thing. It was because of her age and she had some minor medical conditions like migraine headaches which can cause her upset stomach too but it was because of her age. Therapeutic measures were taken as a result of upset stomach and diarrhea that included reporter stated nothing, just change in her diet, drinking more fluids. The patient recovered from diarrhea, the outcome of the event upset stomach was not resolving, the outcome of the event headache was not resolved.  Follow-up (14MAY2021): Follow-up attempts completed. No further information expected.