Hives (Urticaria)

Hives are raised, itchy welts that can appear suddenly on the skin. Individual welts usually fade within 24 hours, but new ones may continue to appear. When hives last longer than six weeks, they are called chronic urticaria.

Common triggers

Infections, certain foods, medications, insect stings, pressure, temperature changes, and stress can trigger hives. In many chronic cases, no specific external trigger is found.

What to do

• Avoid known triggers when possible
• Non-sedating antihistamines are often the first treatment
• Cool compresses and loose clothing can provide comfort
• Seek urgent care if you have difficulty breathing, swelling of the lips/tongue/throat, or feel faint – these can be signs of a serious allergic reaction