I am new here but have had this same issue following the 2nd dose of Pfizer. I have had Mulitple Myeloma and have been in remission for 3.5 years but still have blood drawn and cancer markers drawn...otherwise I would not have known of this issue. My hgb was 14 on 7/31 which is the same day I got the 2nd vaccine shot. On 8/26 I had a physician appt so they drew a ton of labs in preparation and my hgb was 12. Didn't really pay any attention to it as it's not that bad. Also on 8/26 I started on Melaxicam which is a strong ibuprofen, for lack of another term. On 9/8 my labs were drawn for my oncologist: HGB: 10.8. HCT: 31.9. Iron 20; Iron Sat 8
They stopped the Melaxicam thinking it could be a GI bleed. They also scheduled me for an EGD and colonoscopy. I know I don't have a bleed and I didn't have any GI upset with the Melaxicam. I know we have to check those just to make sure they aren't the cause but I really feel it is the vaccine and it caused a fast drop. I was started on Iron. I will have labs drawn again next Friday on 9/24/21. I'm assuming my Fe will be up since I'm on Iron. I did not report it to VAERS.