Brynn Duncan is the girl who is allergic to almost everything, including air. She suffers from Mast Cell Activation Syndrome, a rare disease that causes her body to overreact to everyday stimuli, triggering allergic reactions.
Brynn's condition has forced her to live a very restrictive life, often confined to her home to avoid triggers. While there is no cure for Mast Cell Activation Syndrome, there are ways to manage the condition, such as avoiding triggers and taking medications.
