Asthma is broadly classified in many forms. One such classification is based on asthma due to non allergic environment and is assigned the name Intrinsic or Non Allergic asthma. Intrinsic asthma is basically a non seasonal and non allergic form of asthma and occurs persistently rather than in episodes.

The origin of this type of asthma is not known but the factors responsible for triggering non allergic or intrinsic asthma.  Non allergic asthma occurs due to inflammations and obstruction in the airway and not due to allergic reactions. Basically the immune system is not involved in non allergic asthma.

As the name suggests Intrinsic asthma is triggered due to the factors which are not related to allergies. It is caused due to inhalation of pollutants that causes irritation to lungs. The post affects of this type of asthma are very bad. It can cause permanent damage to the airways, and in some cases may even lead to death. The person also encounters severe breathlessness, school absenteeism, or even home confinement.

Intrinsic asthma develops generally at the age of 30 to 40 years or in some cases it may develop in a child of about 5 years. Only for 10% of asthmatics have this type of asthma. Intrinsic asthma is mostly developed in women and they report of respiratory tract infections. Intrinsic asthma affects the daily routine of a person and hence it should be treated in early stages itself.