What different types of asthma exist and how many different types are there?

One: Asthma is a diagnosed made based on symptoms and objective findings on lung function tests and is pathologically defined as inflammation of the airway lining and constriction of the muscles in the airways in response to triggers such as allergens (pollen, dust mites, pet dander, mold), chemicals, viruses, cold temperature, exercise, etc to name a few..

Several classificati: There are several ways to classify asthma - based on symptom frequency & severity, control of symptoms while on therapy, associated conditions (atopic versus non-atopic), mechanisms (aspirin-sensitivity, exercise induced) and now more recently based on inflammatory cell types (eosinophilic versus neutrophilic) etc. Identification of precipitating factors & comorbid conditions also define it furthe.