Welp, I had finals this week, finished my last one on Wednesday, woke up today (Thursday), and had hives everywhere. I have no known allergies. I know stress can bring on hives, and I had plenty of that during the week, but no hives. Now that I'm relatively stress free, I wake up and they're everywhere. I though hives came while you were stressed, not after. Is this like a late reaction to the stress or something?

I'm 21, male, and haven't had hives for years.