Unless you have allergies, you don't tend to hear about them much, but they can be seriously life-threatening if people aren't properly educated on them. Food allergies alone increased 50% among US children from 1997 to 2011, and complications can range from a runny nose to fatal anaphylaxis.
Though allergies were once picked on or treated as a joke, certain famous face are speaking out on their personal experiences with allergies—from nuts to hair products—and are helping to normalize the topic and educate the public.
From Ariana Grande to Steve Martin, see which stars have opened up about their intense allergies.