Medically reviewed by Daniel More, MD Key Takeaways Hives are little bumps caused by an immune system reaction and can be ...

What are hives and what causes them? Hives are a term used to describe a medical condition known as urticaria, a skin disorder that occurs when the body’s immune system responds to an allergic threat.

Hives, or urticaria, can occur for many reasons, such as exposure to an allergen or a physical trigger, like pressure from tight clothing. It may also indicate an infection or another underlying ...

Hives are one of those things that you hear about so often that it feels like you should know what they are, how to spot them and how to treat them. But the truth is that many of us don’t really know ...

Hives are a common symptom of COVID-19 that can occur during the day or night. Hives only at night might be from something you’re coming into contact with in the evenings. COVID-19 can cause hives ...

Hives are a type of rash with a distinct appearance and behavior. Hives aren’t generally dangerous and often go away on their ...

Doctors call it "urticaria," but everyone else calls it "hives." We're talking about the incredibly itchy, swollen rash that can suddenly show up on skin, without warning, only to disappear and show ...

They’re red, they’re itchy — and they’re coming for you, just when you need them the least. Hives are a common skin condition, and they typically show up as a red, itchy rash. Known to doctors as ...

This informational guide, part of PS's Condition Center, lays out the realities of this health concern: what it is, what it can look like, and strategies that medical experts say are proven to help.

"A lot of times, patients want to know if something they're doing is causing the hives," said Jenny Murase, MD, of the University of California, San Francisco, and director of Medical Dermatology ...