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Jessica Lee, MD, DipABLM on Instagram: "Could MCAS (mast cell activation syndrome) be the cause of your sinus issues? 🤧 MCAS is characterized by👇🏻 Episodic flares involving two or more body systems (respiratory, GI, skin, cardiovascular) that responds to “anti-mediator” therapy. Ask yourself these questions: 1️⃣ How long does my nasal congestion/sinus pressure/ear fullness/etc last? (MCAS episodes are typically distinct and last less than 24hrs-sometimes only minutes) 2️⃣ What other symptoms