Crystal Goodwin is a 29-year-old woman who was diagnosed with an extremely rare cell syndrome known as mast cell activation syndrome (MCAS) or mast cell activation disorder (MCAD). This makes her allergic to everything and what this syndrome/disorder can do is truly terrifying.
It affects pretty much every organ system potentially (due to accumulation of mast cells accompanied by inconsistent release of mast cells mediator). In particular, it affects both cardiovascular and nervous system, skin and gastrointestinal tract.
Just imagine how a person who is allergic to the world would struggle to live normally, keeping in mind that anything could cause death. Watch this documentary.