Obstructive Lung Diseases is a medical term that refers to a group of respiratory conditions that make breathing difficult. These diseases include chronic obstructive pulmonary disease (COPD), asthma, bronchiectasis, and cystic fibrosis. Antonyms for obstructive lung diseases are non-obstructive or non-restrictive lung diseases. Examples include interstitial lung diseases, such as idiopathic pulmonary fibrosis, hypersensitivity pneumonitis, and sarcoidosis. Non-obstructive lung diseases typically involve inflammation and scarring of the lung tissue, resulting in decreased lung function. Unlike obstructive lung diseases, they may not have significant impact on airflow, but they can cause symptoms such as shortness of breath, fatigue, and coughing.