Iron Infusion Side Effects Are Common but Almost Never Dangerous, With One Sneaky Exception
Most iron infusion side effects are mild, short-lived, and affect only a small percentage of people. Across large studies tracking tens of thousands of infusions, overall reaction rates land around 2 to 4 percent, and the vast majority of those reactions amount to temporary discomfort: flushing, a little nausea, maybe some itching. True emergencies are extraordinarily rare. But there is one side effect that flies under the radar, and it has nothing to do with allergic reactions. Repeated infusions of a specific formulation can quietly drain your phosphate levels, eventually causing bone pain, weakening, and even fractures. That is worth understanding before your first or fifth infusion.