Exercise-Induced Bronchoconstriction (EIB) is a narrowing of the airways causing difficulty moving air out of the lungs. Chronic asthma is an inflammatory disorder. Most patients with chronic asthma will have a flare when they exercise. Other individuals appear to have a flare of asthma only when they exercise and do not otherwise have chronic asthma.

Symptoms include coughing, wheezing, tight chest, and prolonged and unexpected shortness of breath after about 6 to 8 minutes of exercise. These symptoms are often even worse in cold, dry air. Warm and humid air may lessen the symptoms. Unfortunately pollens and molds are present at the times of the year when the air is warm and humid and these substances in the air may also trigger attacks of asthma.