Urinary tract infection; when the doctor pushed on his bladder it hurt; tightness in his head; cold sweats; fever/went up to 101, 101.8, 101.9/temperature would go up to 100 or 101; Headache; Flu-like symptoms; stiffness of his body; dizziness/woozy; dizziness occurred when he stood up to leave/had dizziness and it went away and possibly occurred because he got up too quick; This is a spontaneous report from a contactable consumer (patient). A 73-year-old male patient received the first dose of BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, lot number EL1284), intramuscularly on the left arm, on 12Jan2021 14:00, at single dose, for covid-19 immunization. The patient's medical history and concomitant medications were not reported. The patient and his wife went to the local senior citizen center on 12Jan2021 to get the vaccine. After which the patient noticed a slight dizziness on 12Jan2021 which was minimal, and the dizziness was something that was normal for him. The dizziness started within 15 minutes time frame after receiving the vaccine. The dizziness occurred when he stood up to leave on 12Jan2021; now the dizziness has recovered. He stated he had dizziness and it went away and possibly occurred because he got up too quick. He also felt a little woozy on 12Jan2021 and it was under control. The next day, on 13Jan2021, after receiving the vaccine he experienced fever, headache, almost flu-like symptoms, and stiffness of his body. His fever went up to 101, 101.8, 101.9 that night of 13Jan2021; earlier in the afternoon of 13Jan2021 around 15:00, he noticed a weirdness as he had a tightness in his head and then discovered he had a fever. He also had cold sweats, on the night of 13Jan2021, and his clothing was soaked - this occurred on a couple of evenings since then. Furthermore, he noticed in Jan2021 there was a cycle that continued where he did not have high temperature in the morning, his temperature was around 99 after breakfast and then his temperature would go up to 100 or 101 towards the evening. The fever lasted quite a while until 21Jan2021, about 8 days. He had a virtual visit on 21Jan2021 with his primary care provider since he had a fever. He also had a covid test that was negative on 21Jan2021. He then added that he also had a negative covid test on 18Jan2021; it was not the rapid test but a test that started with a "p". With these, his primary care provider was very much concerned, and he had a battery of tests done then he was discovered to have a urinary tract infection (UTI) on 22Jan2021. He informed that his primary care provider asked him to go into the office since the primary care provider was convinced that it was something more than just a reaction to the Pfizer covid vaccine. He had more tests on 22Jan2021 and that was when he was diagnosed with a UTI. It was a minimal UTI, not of any consequence, that when the doctor pushed on his bladder it hurt on 22Jan2021. He then received an intravenous antibiotic in the emergency room for the UTI but confirmed that he was not admitted. He stated that he has never had a reaction to any medication he has taken before. He then asked if he should get the second dose, the "booster" of the covid vaccine. He admitted he was quite reluctant to get the second dose that was scheduled for 02Feb2021 and his primary care provider advised against getting the second dose. The outcome of the event dizziness/woozy and dizziness occurred when he stood up to leave/had dizziness and it went away and possibly occurred because he got up too quick was recovered on 12Jan2021. The outcome of the event fever was recovered on 21Jan2021. The patient was recovering from UTI. The outcome of the events tightness in his head and when the doctor pushed on his bladder it hurt was unknown. The outcome of the events headache, flu-like symptoms, stiffness of his body and, cold sweats was recovered on Jan2021 (duration reported as "-12 day"). All adverse events resulted in an emergency room visit and a physician office visit.