A look at the 4 asthma severity levels.

For most children, the reaction to a sting is brief, with redness and swelling followed by pain and itching. Others may have an allergic reaction that is life-threatening. Read on for details.

Detailed information on allergy, asthma, and immunology

Detailed information on the immune system and immune disorders

Hives are a sudden outbreak of red, itchy, and swollen areas on the skin. They often happen as an allergic reaction from eating certain foods or taking certain medicines. Here's what you should know.

Helpful instructions on giving your child nebulizer treatments.

Parents of children with egg sensitivity may not be aware of the many food products that contain eggs. That's why it's important to carefully read food labels. Here's what you should know.

Burns are classified as first-, second-, or third-degree, depending on how deeply and severely they penetrate the skin's surface.

There are tests and procedures that can help keep track of your health and your baby's health during pregnancy. Understand what questions to ask about these tests and procedures, and know which health problems may need testing.

Digestion is the process of breaking down food and drink into smaller parts so that the body can use them to build and nourish cells, and to provide energy.