What causes EIB?
Breathing in air that is cooler and drier than the air in your lungs during exercise may cause EIB. If you have EIB and chronic asthma, your symptoms may get worse during spring and fall, when people tend to have trouble with allergies.
Recognition and Management of Exercise-Induced Bronchospasm by T Sinha, MD; AK David, MD (American Family Physician February 15, 2003, http://www.aafp.org/afp/20030215/769.html)
Written by familydoctor.org editorial staff