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Questions in the Category: Mast Cell Activation Syndrome

Mast cell activation syndrome (MCAS)

ME Essential Spring 2026

I keep reading reports that some people with ME/CFS also have a condition called mast cell activation syndrome (MACS). I also saw a report on the MEA website about a new Overlapping Illness Alliance being formed that includes ME/CFS, PoTS and MCAS. So what is MCAS? Can it be treated? And how common is it in people with ME?

Charles Shepherd
ME Essential magazine
ME Medical magazine
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