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 ...

— meaning the cause is unknown — or it could be prompted by a variety of factors that combine and make hives linger. Unlike acute hives, a condition that lasts for short periods and tends to be ...

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

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.

New data challenge common beliefs about antihistamines, corticosteroids, and vaccines in chronic urticaria, with practical ...

"I just want to be able to do normal things and have a normal life and not have to worry." A 16-year-old girl from north Wales says she is "always scared" of having an allergic reaction after being ...

Norovirus doesn’t usually cause a rash, though some people develop hives. A rash that accompanies stomach symptoms may suggest a different stomach virus or inflammatory bowel disease. Norovirus is a ...

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

"There is consistent NHMRC-I evidence to support the role of a low-histamine diet for the management of symptoms in chronic urticaria, while the effect of a low-histamine diet for other conditions ...