Severe chills; I had chills off and on; We had 90 degree weather and I couldn't stand having the fan blowing; I was just chilled, I was constantly under blankets and heating pad; I just didn't feel good at all; I didn't want to eat; My right leg, especially my ankle and foot are just been swelling; It is really tight; My right leg, especially my ankle and foot are just been swelling; It is really tight; This is a spontaneous report from a contactable consumer. This is the first case out of two cases in which the reporter is reporting for herself. A female patient of an unspecified age received bnt162b2 (PFIZER-BIONTECH m-RNA COVID-19 VACCINE, Solution for injection, Batch/Lot number was not reported) via an unspecified route of administration on 18Aug2021 as DOSE 1, SINGLE for covid-19 immunisation. The patient medical and concomitant medications were not reported. On an unspecified date, the patient experienced severe chills, i had chills off and on; we had 90 degree weather and i couldn't stand having the fan blowing; i was just chilled, i was constantly under blankets and heating pad (chills), i just didn't feel good at all (malaise), i didn't want to eat (decreased appetite), my right leg, especially my ankle and foot are just been swelling; it is really tight (muscle tightness) and (peripheral swelling). Additional Information included, Consumer stated, "I had my first dose, Pfizer shot here almost three weeks ago and I am due for the second one in two days and I am really concerned about it because I did, not immediately had a reaction but within 24 hours, I ended up with severe chills that lasted for about 2 days and I had chills off and on, I mean we had 90 degree weather and I couldn't stand having the fan blowing or like just air conditioner on. I just didn't feel good at all, it made me feel, I just 'wonder' I am an elderly person and usually pretty healthy but I am kind of concerned about going for the second shot with that kind of a reaction on the first one." When paraphrased the concern, consumer stated, "For two days, it was pretty constant, I was just chilled, I was constantly under blankets and heating pad and I just didn't feel like, I didn't throw up but I didn't want to eat, I guess I was miserable. "I mean, my friends has had the shot, my brother and his wife, his wife got, almost died with it, she got so sick. I am just feared you know. Also, my right leg, especially my ankle and foot are just been swelling more than normal, 'to more than', it is really tight." Caller would like to know if the side effects following the 2nd dose are worse or "more" than the 1st or are they worse if she experienced side effects after having the 1st dose of the vaccine. The caller is discouraged because she states she did not want to get the 1st vaccine, however her HCP convinced her to. After having the 1st dose of the shot she had chills that remain ongoing. Caller states that she is "apprehensive" to get the 2nd shot since she has not "felt well" since having the vaccine. She said she had chills for 3 days following the vaccine and still gets "chilly." She states the weather is 80-90 degrees and she cannot stand having a fan on much less being in the AC at times. Caller states that her HCP will say to get the 2nd dose regardless and not worry about it. The caller would like to know if we have any information regarding what may happen if she does not get the 2nd dose of the vaccine. Caller also reports that she has a sister in law in another state and she thought "she was going to die she was so sick on it" after she had her 2nd vaccine. The outcome of the event was unknown.  Information about lot/batch number has been requested.