In-depth

Causes

Atopic dermatitis (eczema)

Atopic dermatitis can be extremely itchy and uncomfortable. Find relief with these home care options and medical treatments.

Drug allergy

Drug allergy can occur with many medications. Find out what you can do to recognize and avoid potentially dangerous reactions.

Definition

Allergies and asthma

Allergies and asthma are often linked. A Mayo Clinic specialist discusses how they're connected — and what you can do to manage both.

Prevention

Risk factors

Food allergy

Food allergy symptoms can make you miserable. Unfortunately, there's no cure — but there are steps you can take to keep your symptoms in check.

Symptoms

Anaphylaxis

Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.

Bradycardia

Bradycardia, a slower than normal heart rate, can cause the heart to pump too little oxygen-rich blood to the body.

Hives and angioedema

Hives and angioedema — Comprehensive overview covers symptoms, causes, treatment of these common allergic disorders.

Nausea and vomiting

Sick to your stomach? Nausea and vomiting usually pass quickly but sometimes result from long-term or serious conditions.

Runny nose

Runny nose: What's causing your sniffles?

Shortness of breath

Shortness of breath can be frightening. Most of the time, a heart or lung condition is the cause.

Tachycardia

Tachycardia, a rapid heart rate, is caused by an abnormality in your heart's electrical impulses. Tachycardia can cause serious complications, including sudden cardiac arrest.

Watery eyes

Tearing that goes beyond a happy or sad moment can stem from a variety of causes, from hay fever to more serious conditions.

Tests and diagnosis

Allergy skin tests

Itching, sneezing and swelling: Find out what's causing your allergy symptoms.

Treatments and drugs

Allergy medications

Which allergy medications are likely to relieve your symptoms? Find out about different medications, why they're used and potential side effects.

Breast-feeding and medications

When you're breast-feeding, medications aren't necessarily off-limits — but caution is important. Get answers to common questions about breast-feeding and medications.

Prednisone risks, benefits

Corticosteroids, such as prednisone and cortisone, are used to successfully treat a variety of conditions. But these medications can also cause unwanted side effects. Get the facts here.

Prednisone risks, benefits

Corticosteroids, such as prednisone and cortisone, are used to successfully treat a variety of conditions. But these medications can also cause unwanted side effects. Get the facts here.

Jan. 29, 2013