Chronic Obstructive Pulmonary Disease or COPD is a group of lung diseases that make it hard for you to breathe normally. If you have this condition, you will likely be coughing frequently and experiencing shortness of breath. People who have COPD can be at early, moderate, severe, or very severe stages. While treating COPD at the beginning stages is easy, managing it at the severe or very severe stage can be troublesome. So, it is necessary to prevent its exacerbations. But, in order to do that, you must first learn to recognise worsening COPD symptoms.for more:https://www.resmed.co.in/healthcare-professionals/diagnosis-and-treatment/respiratory-care/copd/what-is-copd