Common symptoms include:
- Raised red or skin-colored welts
- Intense itching
- Burning or stinging sensations
- Swelling that changes shape or location
- Symptoms that appear and disappear over time
One of the most frustrating aspects of hives is their unpredictable nature. A patch may vanish within hours only to reappear somewhere else on the body.
Many people notice flare-ups after exposure to certain triggers. Common examples include:
- Nuts, shellfish, eggs, or dairy products
- Antibiotics and pain medications
- Viral infections
- Heat or cold exposure
- Emotional stress
- Physical pressure on the skin
- Exercise-induced reactions
In chronic cases, symptoms persist for more than six weeks. Researchers believe autoimmune processes may play a role in some patients, causing the immune system to mistakenly activate even without an obvious external trigger.
When Hives Become More Than a Skin Problem
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Although hives are usually harmless, they can sometimes be accompanied by a more serious condition known as angioedema.
Angioedema involves deeper swelling beneath the skin rather than on the surface. It most commonly affects the lips, eyelids, tongue, throat, hands, and feet. Unlike ordinary hives, the swelling may be painful rather than itchy and can take much longer to disappear.
When swelling affects the throat or airways, immediate medical attention is required because breathing can become difficult.
Experts recommend seeking urgent care if any of the following symptoms occur: