What is the difference between copd and ashtma?

Overlap: A lot in symptoms, diagnosis and treatment, but COPD mainly affects smokers, adults, long history of bronchitis, asthma affects all ages, whether allergic or non allergic, a person can have both, not uncommon

Asthma/COPD: Asthma is otherwise called reactive airway disease and is usually caused by an allergic trigger. COPD is generally the result of disease caused by smoking. Both cause obstruction to breathing. Asthma is most often reversible as COPD is permanent. All the best. Check NIH site.

Difference: Asthma- inflammation of the airways leading to airway obstruction which is frequently but not always reversible. High % related to allergies COPD- Chronic obstruction of the airways with or without inflammation. Some may be partly reversible. Highly % related to smoking. Sometimes asthma can lead to COPD although why this happens remains unclear.