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MCAS (Mast Cell Activation Syndrome) has become a common topic in the Lyme disease community, but what is it really? Learn how mast cells work, why MCAS may overlap with Lyme disease, common symptoms, potential triggers, how it's diagnosed, and what current research says about the connection.

Wondering why just a few minutes in the sun can leave you exhausted, dizzy, or overwhelmed by brain fog? Learn the most common reasons people with Lyme disease may become sensitive to heat and sunlight, including dysautonomia, medication photosensitivity, mast cell activation, and nervous system dysfunction. Plus, discover practical tips to help reduce symptom flares while safely spending more time outdoors.