If you ever thought that exercise might kill you, it's possible you weren't exaggerating.
Research has shown that exercise-induced allergies are responsible for 5 to 15 percent of anaphylactic shock cases, ABC Los Angeles reports. That's what happened to marathon runner Mayra Suarez, who told ABC Los Angeles she is no longer allowed to run alone, as strenuous activity triggered a life-threatening allergic reaction that left her nearly dead. "I was having a really hard time breathing," she said. "My lungs, my airways were starting to close up. My eyelids were pretty swollen. I started running around looking for some antihistamine."
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