I found this post searching for reasons why I would lose so much iron in a year. I recently went to the ER for something totally unrelated. They took blood and all the sudden im being told I need a blood transfusion and admitted to the hospital. I spent 3 days in the hospital having ct scans, ekg, blood taken, etc. and answered a million questions. Left with referral for GI and hematology consults. I had surgery a year ago on my shoulder and a full blood panel right after. Everything normal. My hemoglobin at the hospital was 6.2. After the transfusion when I left the hospital I was at 7.1. Hematologist said I had basically no iron at 2%. Since I have had an endoscopy and colonoscopy with nothing found. Ive had 3 iron infusions and have been waiting for my follow up with hemotology coming up next month. I was diagnosed with severe iron deficient anemia/feropenia. Nobody understands why this would happen. Ive had no bleeding events, and regular non heavy periods. I was honestly hoping for an ulcer or something that would give me answers. The only thing different I have done is the moderna vaccine which after the second shot I started menstruating the very next day. Completely off schedule it was very light but I spotted constantly for almost a month. I went to the gyno for tests in that area as well. Nothing found. So I too am wondering if the vaccine may have something to do with it. Probably just grasping at straws but its alarming not knowing.