arm is hard where injection; Chills; Overheating; Sore arm; Temperature went down to 96; This is a spontaneous report received from a contactable consumer (patient) via medical information Team. A 67-year-old female patient received second dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, formulation: solution for injection Batch/Lot number was not reported), via an unspecified route of administration, on Arm Right on 30Mar2021 13:10 as 2ND DOSE, SINGLE for COVID-19 immunisation in hospital. Medical history included ongoing arthritis, lung problems and arm is hard. Historical vaccine include flu shot on Oct2020 (to right arm) and first dose of BNT162B for COVID-19 immunisation. Concomitant medications included vitamin B12 taken for arthritis and vitamin D. It was reported that, the patient got the COVID 19 vaccine on Tuesday (30Mar2021) and she just had a sore arm on the same day. Caller stated on Wednesday (31Mar2021) she got the chills and wrapped herself up and laid down for a while then she warmed up and then a little while later, she overheated. Caller stated she checked her temperature when she was overheated, and temperature went down to 96 on an unspecified date in 2021. Caller further stated that, chills started on 31Mar2021 and they will come and go. Caller stated she will be fine in the morning and later on she gets chills and then she will lay down and have a blanket over her and she will fall asleep or lay there in lala land like a dream and she was not sure how long but later she warms up and has no chills. Caller stated then she will get up and go sit in her recliner and then 15 minutes to a half hour later she will get overheated and will have to take off her shirt. Caller stated the chills have improved a little but still getting them. She was overheated right now, and she does not have her heat on, and it was cold outside. Caller stated she was only a little warm right now not like she was yesterday. The event temperature went down to 96: Caller stated this happened when she was overheated. Caller stated but when she had chills, her temperature was 98 and that was usually what her temperature normally is. Caller stated but when she overheated twice her temperature was 96 and she was thinking she must be half dead and not in a spooky way, but she was not sure. Caller stated she has been taking her temperature off and on since Wednesday. Caller stated she wanted to take her temperature to see how low it was to see since it was as if she was getting the flu and then she would check it 15 minutes later and it would be the same or a little higher. Caller stated she was confused because when she was overheating it went down and she thought her temperature would go up. Caller stated she was not sure if this was because of the shot or since she has lung problems and arthritis. Caller stated but her temperature was only 96 twice when she had taken it. On 02Apr2021, the patient arm was hard where injection done. She took Vitamin B12, a medication for her arthritis, and vitamin D this morning. The patient was not visited emergency room and physician office. The patient received treatment with Ibuprofen. The outcome of the event sore arm, chills, overheating was recovering, for arm is hard where injection was not recovered and for temperature went down to 96 was unknown.  No follow-up attempts are possible; information about lot/batch number cannot be obtained.