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0:23
Imagine your body could randomly go into anaphylaxis without actually being allergic to anything... and you had no way of knowing. That’s a reality for many people living with Mast Cell Activation Syndrome (MCAS). MCAS causes mast cells, part of the immune system, to release chemicals they shouldn’t, sometimes in response to triggers, sometimes seemingly out of nowhere. The result can range from flushing and hives to difficulty breathing, low blood pressure, and in some cases, anaphylaxis. The h
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