I usually do a lot of physical works very healthy lifestyle. I never had any low iron issues in my life. I don’t drink and smoke and love red meat, and I am 41 years old.
I had my first Pfizer in Feb 2021.
Felt a bit tired, a lot easier compared to the past in March and April 2021.
Had my second Pfizer vaccine at the beginning of May.
The situation was getting worse. I started to cough at the beginning of July. Saw the doctor a few times could find any problems.
Middle August 2021. I started feeling extremely weak. I couldn’t work even walk up to the first floor from the ground floor without stopping and had a rest. My heart was pumping like mad. Therefore I went to the A and E departments. They did all sorts of tests and found my haemoglobin level was only 56 (the average level should be 130-165). They gave me two units of blood transfusion immediately (950ml of blood). And brought the Haemoglobin level to 81, it was still low, but I felt much better immediately. And my cough was gone. The doctor explained because my heart was pumping so hard for such a long time. That’s was the reason for the cough.
They didn’t find internal bleeding or any other issues, and no one could explain why my haemoglobin level was that low. I left The hospital Without any Prescription.

The Pfizer vaccine can cause iron depletion. With that in mind, if you are feeling tired after Vaccine. Highly recommend checking the iron and haemoglobin level. If you have any heart conditions and you do nothing, it can be life-threatening.