You might know that anaphylaxis — a severe allergic reaction — can occur in response to triggers such as nuts, insect bites, and certain medications. But physical activity can also induce anaphylaxis.

Q: Whenever I exercise for 20 minutes or more, I get itchy all over my body. Round bumps start swelling up all over my body. As I cool down, the bumps start going away, but then I get weak, dizzy and ...

Allergies can cause hives, and foods like nuts, milk, and eggs are common triggers. Environmental factors like sunlight, water, and heat can cause hives in some people. Stress can make hives worse, ...

Vibratory urticaria is a rare condition that causes allergic-like skin reactions after exposure to certain types of vibration, stretching, or friction. Treatment involves trigger avoidance and ...

Stress affects every aspect of our lives and how you cope has a big impact on your overall health, including your skin. If you have hives, stress can cause a flare-up of hives. Such "stress rash," the ...

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 ...

Pressure urticaria is a type of chronic urticaria that causes recurring hives from pressure applied to your skin. It may be treated with a combination of trigger avoidance and medications. Better ...