Asthma is caused by inflammation and irritation of the respiratory tract. When there is an asthma attack, the muscles surrounding the Airways, occurs spasm and mucosa of the respiratory tract swells. Due to this bronchi constrict, which reduces the amount of air that passes through them, and there is suffocation.
The basis of asthma lies an allergic nature - hypersensitivity of the body, especially the tissues of the bronchi to various, usually harmless substances - the so-called allergens and triggers. But also has asthma and mental nature of the disease, when the fears or acute mental turmoil provoke coughing and choking.