For most people, cold weather is an inconvenience, requiring an extra layer of clothing or the thermostat to be turned up.

Cold urticaria is a rare but potentially serious condition in which contact with cold weather causes the immune system to ...

In a healthy body, mast cells (the “lookout” cells of the immune system) only release histamine when they detect a foreign ...

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 ...

Both bug bites and hives can cause red, itchy bumps on your skin. While it can be difficult to tell them apart, learning key features and characteristics of each can help. Hives and bug bites are ...

If your skin suddenly turns red, itchy, or inflamed, you may find yourself wondering whether it’s a simple rash or a case of hives. While both conditions affect the skin and can look alike, they are ...

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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 ...

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.

The postpartum period is a time for recovery and healing. When you are busy juggling healing, establishing breastfeeding, and ...