17 Reasons For Prolonged Cough

3. Asthma

Persistent dry cough is the main symptom of cough-variant asthma. This type of asthma doesn’t usually bring out other symptoms, such as shortness of breath or wheezing, which are normally associated with other types of asthma. If you are diagnosed with cough-variant asthma, typical asthma treatments can gradually ease your coughing.