fever; severe chills/could not get warm; her breathing was deep; drop in blood pressure; mild swelling/Swelling of Left Arm; This is a spontaneous report from a contactable consumer (patient). A 74-year-old female patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot EK9231) via an unspecified route of administration in the left arm on 11Jan2021 10:00 at a single dose for COVID-19 vaccine (because she's 74 and high risk). Medical history included hypertension. Concomitant medication included irbesartan oral (by mouth) from an unspecified date (maybe 3 years ago) and ongoing at 300 mg once daily (150mg, 2 tablets once a day in the morning) for hypertension as blood pressure medication. The patient received the first dose of vaccine on Monday (11Jan2021) morning (AM) at 10 at the county (public) health department. She had no problem at all until yesterday Tuesday, she experienced mild swelling; the swelling happened in the upper left arm (swelling of left arm) which started on 12Jan2021, this was also the same side that she got her vaccine on, the left arm. On 13Jan2021 she woke up at 4AM [also reported as thirty (30) hours after the shot] in which she started to have severe chills (horrendous chills), could not get warm under the blanket for an hour and a half. It lasted a long time. Her severe chills did stop, she used an electric (heated) blanket. This morning on 13Jan2021 at 8:30, she woke up with the fever, which she was able to reduce with acetaminophen (did take two acetaminophen). Her fever was also gone. She was a little concerned because she thought her breathing was deep too on 13Jan2021. She did some relaxing breathing which helped. It lasted a long time. The patient also experienced a drop in blood pressure on 13Jan2021. Her blood pressure has been running the past few days at 133/80 on 11Jan2021. Today (13Jan2021), she took her blood pressure and it was at 93/50. It went to 87/56 after drinking some salty soup on 13Jan2021 (the bottom number in the blood pressure was going up a little, and the top number was going down a little). Her blood pressure has been normal 133/70 on Jan2021, but this morning it was 90/50 on 13Jan2021. Her blood pressure has been running normal the last couple of days like 133/90 on Jan2021. She was shocked it was lower. She knew they talk about dizziness and weakness, but she didn't experience that. She was concerned about that sudden drop in blood pressure. She did some research and started eating some salty soup and stuff (has been drinking salty soup). Her bottom number went up to 53 on Jan2021. She was concerned about that drop there. She was wondering if that was a side effect of the vaccine (result of the vaccine). She asked if drop in blood pressure was a concern. She had no positive test for Covid before the vaccine. She never had any tested, she's been pretty isolated. She had no antibody test. She has had no issues with vaccine in the past. Therapeutic measures were taken as a result of severe chills/could not get warm, fever, her breathing was deep, and drop in blood pressure. The outcome of swelling of left arm/mild swelling and drop in blood pressure was not recovered; of severe chills/could not get warm was recovered on 13Jan2021 05:30 and fever was recovered on 13Jan2021; and of her breathing was deep was recovering.