and allergic rhinitis (hay fever) are among the major causes of illness and disability in the United States, affecting as many as 40-50 million Americans. Scientists do not know why certain people experience allergic reactions, but they do know that increased amounts of a substance called leukotrienes play an important role in causing symptoms.
EBSCO Information Services is fully accredited by URAC. URAC is an independent, nonprofit health care accrediting organization dedicated to promoting health care quality through accreditation, certification and commendation.
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.