In Fatal Asthma, pulmonary medicine expert witness Dr. James F. Lineback, Newport Longevity Medical Group, writes:
Asthma is a very common pulmonary problem affecting between three and five percent of the population. Fortunately, fatal asthma is a rare complication, though it often involves young people in the prime of their lives. The definition of asthma is reversible airway obstruction and involves inflammation and narrowing of the airways. Patients experience shortness of breath and feel as if they are breathing through a straw. Allergies, exercise, infections, and stress may cause an acute worsening of their condition.