| http://www.w3.org/ns/prov#value | - What???s triggering them????We don???t know what causes asthma,??? says Nadia Hansel, M.D., assistant professor in the division of pulmonary and critical care at Johns Hopkins Medicine in Baltimore.But it???s possible to identify and avoid situations that make it worse.???The most common triggers are allergens, such as dust, animals and even mice and cockroaches,??? she says.Keep a trigger diary a
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