Asthma triggered by boggy membranes, congested tissues and other native causes such as adrenalin stress or exertion. Intrinsic asthma generally develops later in life and virtually nothing is known of its causes. It carries a worse prognosis than extrinsic asthma and tends to be less responsive to treatment. Intrinsic bronchial hyperactivity can be triggered by infection, exercise, or drugs such as aspirin.

A type I reaction according to the Gell And Coombs Classification .