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Causes of Itchy Hives All Over the Body β€” And How an Allergist Can Help

by | Sep 12, 2025 | Allergy

Causes of Itchy Hives All Over the Body β€” And How an Allergist Can Help

From Keystone Allergy and Asthma Center – Exton, PA

πŸ“žΒ Call or Text us to book your appointment at:Β 484-897-7143

If you or your child suddenly develops itchy, red welts all over the body, it can be uncomfortable and worrying. These raised patches, known as hives (urticaria), are a common skin reaction that can happen at any age. While some hives go away quickly, others may linger or recur, leaving families unsure about the cause.

At Keystone Allergy and Asthma Center in Exton, PA, we help patients across Chester County understand the reasons behind hives and create treatment plans that bring relief.

What Do Hives Look Like?

Hives appear as red or skin-colored welts that may:

  • Itch intensely

  • Change size and shape

  • Appear anywhere on the body

  • Come and go within hours, sometimes shifting around

Common Causes of Hives

1. Allergic Reactions

  • Foods (nuts, shellfish, eggs, milk)

  • Medications (antibiotics, pain relievers)

  • Insect stings or bites

When hives are caused by an allergy, they usually appear suddenly and may be accompanied by swelling or breathing issues β€” a sign to seek emergency care.

2. Infections

Viruses (like colds or the flu), strep throat, or other infections are a leading cause of hives in children.

3. Environmental Triggers

  • Pollen, pet dander, or mold

  • Cold air or heat

  • Pressure on the skin (tight clothing, straps)

4. Stress and Exercise

Sometimes hives can be triggered by physical activity or emotional stress.

5. Chronic Urticaria

If hives last more than 6 weeks, they are considered chronic and may require further evaluation by an allergist.

How an Allergist Can Help

At Keystone Allergy and Asthma Center in Exton, our board-certified allergists provide:

  • Allergy testing to identify triggers

  • Personalized treatment plans (including antihistamines, lifestyle changes, or advanced therapies)

  • Emergency action plans for patients with severe or recurring hives

  • Education for families on when hives are harmless vs. when they require urgent care

When to See a Doctor Immediately

Seek emergency care if hives are accompanied by:

  • Difficulty breathing or swallowing

  • Swelling of the lips, tongue, or throat

  • Dizziness or fainting

These may be signs of a serious allergic reaction (anaphylaxis).

Local Care for Hives and Allergies in Chester County

From Exton to Downingtown, West Chester, Malvern, and across Chester County, families trust Keystone Allergy and Asthma Center for expert evaluation and treatment of hives, allergies, and asthma.

Take the Next Step

If you or your child is struggling with itchy hives, don’t just treat the symptoms β€” find the cause. Schedule an appointment at Keystone Allergy and Asthma Center in Exton, PA today.

πŸ“žΒ Call or Text us to book your appointment at:Β 484-897-7143
πŸ“ Located in Exton and serving patients throughout Chester County.