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Alergias, Asma y Inmunología Allergy and asthma are among the
most common heath problems, with more than 60 million people
afflicted with asthma, seasonal hay fever, or other allergy-
related conditions each year. Allergies can affect anyone.
Generally, allergies are more common in children; however, a
first-time occurrence can happen at any age, or recur after many
years of remission. Allergies tend to occur in families,
although the exact genetic factors that cause it are not yet
understood. Food allergies are seen in 6 percent of children
under age 3 and 3 percent of adults. Nearly 25 million people in
the U.S. have been diagnosed with asthma, with at least 5
million of them children under age 18. Asthma is the third
ranking cause of childhood hospitalizations.