Have you heard of mast cells? They're these fascinating sentinels all throughout the body, acting like antenna to sense what's going on in our internal and external environments. And when they sense issues too often or respond too intensely, we can end up feeling like we're stuck with "mystery symptoms" that no one can figure out. No one but Beth O'Hara, that is. Beth is an expert in all things mast cell and mast cell activation syndrome, and she's here to drop ALL the knowledge bombs on this week's episode.