Disease Database Drug Database Alt. Asthma is a chronic inflammatory disorder of the airway. It is a reversible condition in which the airway is narrowed or obstructed because of inflammation, increase in mucous production and contraction of muscles in the airway. Although physicians don't know the main cause of asthma, there are identified environmental factors associated with the development of asthma and the tendency to develop asthma is often inherited. In the majority of children with asthma, there is evidence of exposure and development of sensitivity to allergens.
Food occasionally causes asthma, especially in infants.
In the majority of cases of childhood asthma, the onset of asthma occurs by the seventh year. It is not necessary for children to be allergic to anything to have asthma. In addition to allergic reactions other things can trigger or aggravate asthma. These include viral respiratory tract infections, rapid changes in temperature or humidity, common air pollutants in cities, smoke from tobacco or wood, paint fumes, cockroaches and exercise. Some of the signs and symptoms of an asthma attack include wheezing, rapid breathing, difficulty in breathing, sweating, an increased heart rate, a feeling of chest tightness, and coughing, especially at night, early morning, and with activity.