answered May 01, 2011 at 04:49PM
Asthma is the term given to a disease which causes difficulty breathing due to narrowing of the airways. This narrowing can result from airway inflammation or excessive mucous productions, along with airway spasm. Allergic reactions and infections can often set off a worsening of the asthma or "asthma attack", among many other triggers.
Esosinophils are a type of cell found in the blood. They can be elevated with allergies or certain infections so often people who have asthma will have elevated esosinophils in their blood due to allergies or infections. These cells are the body's way of dealing with these health problems.