diarrhea; arm was a little sore; This is a spontaneous report received from a contactable reporter(s) (Consumer or other non HCP).  A 68 year-old female patient received bnt162b2 (BNT162B2), administered in arm left, administration date 25Apr2021 10:00 (Lot number: EP7533) at the age of 68 years as dose 1, single for covid-19 immunisation. Relevant medical history included: "Myocardial infarction" (unspecified if ongoing), notes: Verbatim: heart attack five years ago, taking regular medicine for heart problem; "Depression" (unspecified if ongoing), notes: 5 or 6 years ago, her gynecologist put her on a shot for osteoporosis, one made her have depression. The patient's concomitant medications were not reported. The following information was reported: DIARRHOEA (non-serious) with onset 26Apr2021, outcome "recovering", described as "diarrhea"; PAIN IN EXTREMITY (non-serious) with onset 26Apr2021, outcome "recovered" (27Apr2021), described as "arm was a little sore".  Additional information: Caller stated she received her first vaccine on 25 APR 2021, which was two weeks ago Sunday. Caller stated the Monday following her vaccine, she began with diarrhea and when she said diarrhea, it was like water, she went 10 to 11 times a day. Caller stated it continued like that until this past Sunday, two weeks. Caller states the first full week or week and a half, it was like water, she would go between 8 to 10 or 11,12 times a day and then after like day 8 she would say it was less often and so now it was like almost a formed BM. Caller states she was not going like she was but like three times a day now, she has improved. Caller also stated her arm was a little sore the next day, she guesses for two days or so, not excruitiating. Caller confirms she has recovered completely and was recovered by 27 APR 2021. Caller stated she didn't go to the doctor because she was retired and she could go to the bathroom when she had to go. Caller stated she was on heart medicine, which that could have affected that but she felt like it was the shot that did it. Caller stated her next question was she's supposed to get her second shot this Sunday. Caller stated everybody tells her that the side effects are always worse after the second one. Caller asks should she be prepared for that? Caller states she's concerned because she will be leaving for vacation four weeks after that shot. Caller states she got it because she is planning on going on vacation and they say that she had to have the shot. Caller stated she will be on a plane out, and on vacation she did not know where the next bathroom will be. Caller asking should she wait to get the second shot? Caller stated she had a heart attack five years ago and she is on four medications daily. Caller reported she doesn't ever have constipation, she does go regularly everyday so this was so out of the norm for her to go that much and for it to be water and when she had to go she had to get there, there was no talking about it. The vaccination facility is pharmacy. The patient did not receive any other vaccines within 4 weeks prior to the COVID vaccine. The patient experience adverse events prior to vaccination. Caller states 5 or 6 years ago, her gynecologist put her on a shot for osteoporosis and she took it three different times, it's a 6-month shot, and after the 3rd one, she refused to take anymore. Caller stated one made her have depression, one she slept for hours and hours after she had one which is not normal for her to do. Caller did not provide LOT, NDC, or Expiry date of shot. Caller stated the last one she had was at least six years ago, she just doesn't recall off hand. Caller stated she went back to the gynecologist and the doctor said she definitely didn't need to take that again.  No follow-up attempts are possible. No further information is expected.