CAUSES

CAUSES:- Asthma is almost certainly due to a mixture of environmental and genetic aspects. A person is more likely to acquire asthma if it runs in his/her family and if one is sensitive to allergens or irritants in the environment. Initial, recurrent infections and constant exposure to secondhand smoke or specific allergens may boost the probability of developing asthma.
Exposure to a range of allergens and irritants may set off asthma symptoms. The following are common things that activate asthma symptoms:
Allergens (pollen, animal dander or mold)
Air pollutants, irritants
Cockroaches, dust mites
Strong odors, scented products, chemicals
Smoke
Physical hard work, including exercise
Respiratory infections (for example, the common cold)
Cold air
Intense emotions and stress
Sinusitis
Sulfites, preservatives put in some perishable foods
Specific medications (beta blockers, aspirin and other non-steroidal anti-inflammatory drugs) Gastroesophageal Reflux Disease (GERD)--a state in which stomach acids reverse into the esophagus. GERD may set off an asthma attack or make an attack worse.