extrinsic asthma

Extrinsic asthma is a type of allergic lung disease characterized by the spasmotic contraction of airway smooth muscle, increased mucus production, and airway obstruction. It commonly appears in childhood and is linked to an inherited tendency to develop allergies (atopy). Individuals with extrinsic asthma have specific antibodies to common allergens like pollen, mold spores, animal proteins, and substances from insects found in house dust.1

Exposure to these allergens triggers asthma attacks, which can be more severe in the early morning hours. The lungs are susceptible to allergic responses due to their direct exposure to the environment, the presence of smooth muscle in bronchial walls that can contract when stimulated by histamine, and a large vascular bed involved in inflammation. Treatment may involve medications that prevent mast cell degranulation or block histamine effects.12