States that his symptoms are like he had a stroke; his health declined after the shot; not eating; he is not able to walk by himself; Can't stand up on his own; Mind is not working correctly/The patient was not himself/his mind goes in and out; Speech is Difficult/he was not responding to her and his speech was bad; not feeling very well/not feeling good; Tired and Sleepy; Tired and Sleepy; Noticed patient was warm but didn't take temperature; The patient didn't receive the second shot because he has been in the hospital.; This is a spontaneous report from a contactable consumer (patient's wife). An 89-year-old male patient received BNT162B2 (PFIZER-BIONTECH COVID-19 VACCINE, solution for injection), dose 1 via an unspecified route of administration, administered in Arm Right on 04Mar2021 14:15 (Lot Number: EN6198) at the age of 89 years, as single dose for covid-19 immunisation. Medical history included pituitary gland tumour from 2018 and ongoing (it is not growing according to tests), ongoing asthma which he had for years, and ongoing low blood pressure. His blood pressure goes up and down. He has had it for a long time but started this medication 2 years ago because it was too low. Clarified that it was not taken within 2 weeks of receiving the vaccine because his blood pressure had been too high. There were no concomitant medications. The patient previously took fludrocortisone 0.1 mg once a day. The consumer (patient's wife) stated that she called on behalf of her husband. The patient was still in the hospital. The patient received the vaccine on 04Mar2021 and by 11Mar2021, the patient was in the hospital. They have not been able to find out what was wrong with him. The patient's symptoms were like he had a stroke. The patient was 89 years old, so she took him to get the shot and his health declined after the shot and he is still under the care of the (Hospital name) in (City) (State). The reporter clarified that his symptoms were that he was feeling tired and sleepy on 08Mar2021. The patient said he was not feeling good on 08Mar2021. On 11Mar2021, he was not responding to her and his speech was bad, and now he is not able to walk by himself and can't stand up on his own. This started after he received the shot. The patient didn't receive the second shot because he has been in the hospital. He was doing fine before and now he has these issues. The patient's wife (reporter) noticed the patient was a little warm but didn't take his temperature on 08Mar2021. The reporter stated that last Thursday (11Mar2021) they called the doctor and the doctor suggested taking him to the ER at the hospital. On 11Mar2021, the patient was not himself and not eating and she doesn't know what is going on with him, but he is under care at the hospital. Reporter stated the patient is doing therapy in the hospital and they are helping him to walk but he is having difficulty. She stated they keep asking if she knows what is going on, but she has no results or medical records. Reporter stated the patient's mind is not working correctly and speech was difficult for him. She clarified that he wasn't making sense sometimes and she was not able to understand him. States the patient speaks two languages but he started speaking a third language to her. She stated that his mind goes in and out. Treatment: rest and at the hospital they are doing therapy for his legs. States she will get on update on his progress on Friday. States she can't see him because of Covid restrictions. The patient did not receive any vaccines 4 weeks prior to COVID vaccine. Outcome of the events was unknown.