Mast cells are hypersensitive immune cells that release histamine and other inflammatory mediatorsoften in response to oxidative stress, environmental toxins, and immune imbalance. Many patients with MCAS have low levels of glutathione. Mast cell associated disease specific pain syndromes, mast cell Download Scientific Diagram Mast Cell Activation Syndrome (MCAS) Gordon Medical Associates Invisible Pain Series: Mast Cell Activation Syndrome POGO Physio Gold Coast Mast cells are hypersensitive immune cells that release histamine and other inflammatory mediatorsoften in response to oxidative stress, environmental toxins, and immune imbalance. Many patients with MCAS have low levels of glutathione. Mast Cell Activation Syndrome and Its Impact on the Lymphatics