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Pernicious anaemia is caused by your immune system preventing your stomach and gut from absorbing B12 from your food

Still, there are common warning signs that should never be ignored: Persistent sadness or emptiness Loss of interest in hobbies, work, or relationships Fatigue or low energy despite rest Significant changes in appetite or sleep patterns Feelings of guilt, worthlessness, or hopelessness Trouble focusing, remembering, or making decisions Thoughts of death or suicide Some individuals also experience a silent panic attack alongside depression, where overwhelming anxiety occurs without obvious outward signs, making their struggle harder to detect

I would just say, we dont have great information yet about how well commercial tests can tell us about protection based on the level of antibodies