Mast cell activation syndrome (MCAS) is one type of mast cell activation disorder (MCAD), and is an immunological condition in which mast cells inappropriately and excessively release chemical mediators, resulting in a range of chronic symptoms such as as hives, swelling, low blood pressure, difficulty breathing, congestion and severe diarrhea. Mediators released include leukotrienes, histamines, … Continue reading Mast Cell Activation Syndrome