The Toledo Journal reports that an estimated 60 percent of asthma patients have allergic asthma (triggered by dust mites, pet dander, pollen, mold spores, or cockroaches), yet in the U.S., only a small percentage of asthma patients are tested for allergies.

People with allergic asthma may produce too much immunoglobulin E (IgE), which could set off asthma attacks.

‘People are often surprised to find out that approximately 60 percent of asthma patients have allergic asthma,’ says Dr. Bill Storms, allergist with The William Storms Allergy Clinic in Colorado Springs, Colorado. ‘Because IgE is involved early in your body