Mast cell activation syndrome - About the Disease - Genetic and …
https://rarediseases.info.nih.gov/diseases/12981/mast-cell-activation-syndrome/
WEBMast cell activation syndrome (MCAS) causes a person to have repeated severe allergy symptoms affecting several body systems. In MCAS, mast cells mistakenly release too many chemical agents, resulting in symptoms in the skin, gastrointestinal tract, heart, respiratory, and neurologic systems.
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