It is believed that Asthma occurs through a combination of genetic factors and environmental exposure to allergens and irritants.
Genetics: Family history of the condition is one of the most important causes of Asthma. It is generally seen that children of asthmatic parents have a much higher chance of being asthmatic.
Chances of Asthma are also high when there is family history of allergic diseases such as Rhinitis, Urticaria and Eczema.
Environmental factors: Substances such as dust, mites, feathers, pollen, molds, pet dander, etc. are leading causes of Asthma. They are known as "triggers" and "allergens" since they kick start the allergic reaction in Asthma.
Seasonal: Exposure to dry wind, cold air, or sudden changes in weather can exacerbate an asthmatic episode, especially in children.
Aspirin and other related substances: Ingestion of aspirin or non-steroidal anti-inflammatory agents can worsen Asthma.
Air pollutants: Some people show symptoms when exposed to environmental conditions containing increased concentration of airborne pollutants like smoke, strong fumes or odors like household sprays, paint, and gasoline.
Occupational Asthma: Air pollution due to industries from various sources like coal mining, gold mining, cotton textile industries, fumes from welding, gases, etc. is among the rising causes of Asthma.
Infections: The most common stimuli that evoke acute exacerbations of asthma are respiratory infections brought on by different viruses. Infections are major causes of Asthma.
Exercise: Physical exertion can evoke or worsen asthma attacks. Inhalation of cold air during physical exertion adds on to the asthmatic response.
Food preservatives: Causes of Asthma also include sulfites and preservatives added to some types of foods and beverages.
Emotional stress: Severe psychological factors like mental stress, fear or anxiety can worsen the disease progress.