10 surprising reasons why hives might be showing up—and what you can do about them

2. Temperature Fluctuations

Whether it’s a cold breeze, a hot shower, or simply sweating, rapid shifts in temperature can irritate the skin and lead to hives. This condition is known as cold or heat urticaria.

• What You Can Do: Avoid extreme temperatures, shower with lukewarm water, and dress in layers to help your body adjust more gradually. Antihistamines may offer quick relief.