Asthma is caused by a combination of factors, which include genes, environmental and biological triggers, such as infections, dietary patterns, hormonal changes in women and allergens. Allergic asthma is one of the primary causes of asthma, but other types exist. Exercise-induced asthma and nocturnal asthma are two types not associated with allergies.
Cough variant asthma, or CVA for short, is a less common form of asthma that is characterized by the fact that its only symptom is a chronic cough. People who have CVA do not generally have the other common symptoms of asthma, such as wheezing, shortness of breath and chest tightness. CVA is an especially common diagnosis in young children, and it…