Why do hives occur?

Hives (urticaria) can occur for many different reasons. Common causes include:

1. Allergies: Food allergies (such as peanuts, shellfish, milk), drug allergies, insect bites, and animal dander.

2. Infections: Viral, bacterial, or fungal infections can cause hives.

3. Stress: Physical or emotional stress can also cause hives in some people.

4. Physical Tests: Physical factors such as cold, heat, pressure, vibration, and sunlight can cause hives.

5. Autoimmune Reactions: Abnormal immune responses to the body's own tissues can also cause hives.

6. Medications: Certain medications, such as antibiotics, aspirin, and non-steroidal anti-inflammatory drugs (NSAIDs), can cause hives.

In addition to the information above, it is important to meet with your doctor to further discuss the causes of hives and potential treatment options. You may also need to undergo a series of tests to determine the underlying cause.

In order to obtain a detailed history, it is important to answer the following questions:

• How long have you had hives and how often do they occur?
• Have you had hives before?
• Do you have any allergies or a history of allergies?
• Have you tried any new medications or foods recently?
• What other symptoms are present (for example, fever, shortness of breath, joint pain)?

It is recommended that you first see an allergy and immunology specialist. I am not a real doctor and this is not a medical diagnosis.