Exercise induced anaphylaxis: one more cause for syncope.

Syncope is a very common problem. Young people who exercise regularly are considered to be in "good health, " when they complain of passing out during exercise, it must be treated as a serious condition. Exercise Induced Anaphylaxis (EIA) is a well known cause for syncope in sports medicine and allergy literature. A patient's history is critical in making this diagnosis. With the current exercise boom, internists and family practitioners need to be even more aware of EIA when patients complain of syncope with physical activity.