Bleed; Hemoglobin and it had dropped to 6.1; 2nd dose- He was extremely exhausted/weariness/tired feeling; This is a spontaneous report from a contactable consumer (patient's wife). An 85-year-old male patient received bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE), second dose at the age of 85-years-old via an unspecified route of administration, administered in arm left on 15Mar2021 (Batch/Lot number was not reported) as 2nd dose, single dose for covid-19 immunisation. Medical history included ongoing diabetes mellitus, cancer removed from his buttocks (It was either a basal or a squamous and they did not feel it was bad and they had removed it all) on an unspecified date, he has had a stent put in on an unknown date, Had surgery for a valve replacement on an unknown date, heart disorder (He is on a lot of medications) from an unknown date and unknown if ongoing. The patient's concomitant medications were not reported. The patient received the first dose of bnt162b2 (PFIZER-BIONTECH COVID-19 VACCINE) at the age of 85-years-old on 24Feb2021 and experienced he was tired a little bit. After the second dose on 15Mar2021 her husband and her were extremely exhausted, not sleepy, just tired. They were told to expect that though. He was extremely exhausted and this began soon after the COVID vaccine fairly early in the day. Her and her husband came home soon afterwards and looked at each other and said that they were tired and it was not sleepiness, it was not like they needed a nap. It was profound tiredness and exhaustion. Her husband had it more so but they were both in bed for a couple hours. Neither had pain in the injection site though. This lasted for several hours into the evening. Adds that for her husband 1st dose he did not have any effects basically but for his 2nd dose he did have the weariness, not sleepiness, just a tired feeling for several hours. He was just resting and he was also in the hospital but it was for another event not because of the COVID vaccine. She says that it was frightening, he went to the doctor for a routine check up he has had a stent put in and had surgery for a valve replacement at the beginning of the year and also he has had a cancer removed from his buttocks at the beginning of the year. But during his regular check in they did his hemoglobin and it had dropped to 6.1 on 20May2021, and the doctor said that they were going to call an ambulance and her husband said he was going to drive to the hospital since he was only 2 to 3 minutes from there. They admitted him and he was in for 3 days. They can not find the bleed site and they did an endoscopy and they are waiting for him to have an outpatient colonoscopy. They can not figure out the bleed and where it is coming from. He is currently been resting but it is frightening because it was out of the blue. Caller confirms that the stent, cancer and the valve replacement were all prior to the COVID vaccine. The patient was hospitalized for hemoglobin and it had dropped to 6.1 (haemoglobin decreased) and bleed from 20May2021 to 22May2021. The patient underwent lab tests and procedures which included endoscopy: unknown results on May2021, haemoglobin: 6.1 on 20May2021. The patient recovered from fatigue on 15Mar2021 while the outcome of the other events was unknown.   Information on batch/lot number has been requested.; Sender's Comments: Linked Report(s) : US-PFIZER INC-2021595342 same patient, and vaccine, similar event, first dose