Haemoglobin was so low; low iron; He was feeling really sick that day; This is a spontaneous report received from contactable reporter(s) (Consumer or other non HCP) from medical information team. The reporter is the patient.  A 66-year-old male patient received BNT162b2 (BNT162B2), on 31Jan2021 as dose 1, single (Lot number: EL9261) at the age of 64 years for covid-19 immunisation. The patient had no relevant medical history. There were no concomitant medications. The following information was reported: BLOOD IRON DECREASED (hospitalization, medically significant) with onset Mar2021, outcome "unknown", described as "low iron"; HAEMOGLOBIN DECREASED (hospitalization, medically significant), outcome "unknown", described as "Haemoglobin was so low"; MALAISE (non-serious), outcome "unknown", described as "He was feeling really sick that day". The patient was hospitalized for blood iron decreased, haemoglobin decreased (start date: 11Oct2022). The events "low iron" and "haemoglobin was so low" required emergency room visit. The patient underwent the following laboratory tests and procedures: Blood iron: (unspecified date) Low, notes: Low; Haemoglobin: (unspecified date) 10.5, notes: Dropped to 10.5 initially; (unspecified date) Low, notes: It was so low; (10Oct2022) 5.9, notes: Result: 5.9, Unit: Not provided. Therapeutic measures were taken as a result of blood iron decreased, haemoglobin decreased.  Clinical course: caller started about 30-40 days after his first vaccine in Mar2021, and when they first started noticing they didnt correlate it with the vaccine. He doesnt know his iron level for that time. For treatment, they first started him on iron supplements over the counter, 36.5mg once a day. Now they have him on three times a day, after they had him on twice a day. He has been having low iron for a year, and his iron was so bad recently that he had to have infusions. He doesnt know the lab values for his low iron. For the last three months they have given him infusions along with the over the counter iron supplements, and Thursday is his 12th iron infusion, which will be done at the infusion lab. Iron infusion NDC/LOT/EXP: Unknown, not provided to him by the facility, when they do the iron infusion they just hang the bag and do the infusions, and do not give him medical information about it. Caller stated the only other thing is that for the average male hemoglobin is supposed to be 13.5, and his dropped to 10.5 initially, so they were not overly worried, it was not good but it was not bad. This last week it dropped to half that and he was put in the hospital because it was so low. When your hemoglobin drops to 5, it is a deadly situation and can result in death, which 5.9 was his hemoglobin level. He was feeling really sick that day, and he called his doctor who wanted him to have blood tests done, that was on Monday. After she got the results, she called him at eight o'clock at night and told him to go to emergency room and have a blood transfusion. His hemoglobin was 5.9, which can result in major problems, and he spent a day and a half in the hospital getting blood transfusions. He clarifies that this was a week ago Monday, on 10Oct. He went to the hospital in the evening to the emergency room, where he was for four hours before they admitted him to the hospital on 11Oct at 01:00 AM, that was when they decided he had to have an infusion. Other Products reported as No. He went to a routine checkup and didnt connect the two, went to a normal routine medical thing and they noticed his iron levels were very low. They have monitored those for a year and they are still low enough that he takes over the counter iron supplements, and now he has also started getting iron infusions. His low iron levels corresponded to the time he started taking Pfizer COVID-19 vaccine, and he looked for medical information about this and didnt find anything concrete, which he is not saying that this happened because of Pfizer COVID-19 vaccine, but he did a generic search of the internet and found 100s of 100s of anecdotal stories saying the same thing happened to them within 30-45 days of the vaccine, they have depleted iron and doctors cant find out why their iron was depleted, and happened after Pfizer vaccination so he wanted to follow up and let people know, if Pfizer wanted to do an analysis after vaccination. Once your iron is gone, it is gone, you have to try to maintain it with over the the counter supplements etcetera. He wanted to see if Pfizer would look into this, all you have to do is google Pfizer vaccine and iron to definitely see literally hundreds say the same things, healthy fine males and females who can't pinpoint why their iron was suddenly depleted. No further details provided about males or females stories he found in his google search. Caller stated this coming Thursday will be my 12th infusion of iron, plus taking OTC iron supplements three times a day. 12 infusions when you have to go to an oncology lab and they put an IV in you adn sit there for an hour while they load you with iron is quite a bit and there is enough people in my mind that have the same issue I would think pfizer wants to look into it.