Lung disease refers to a variety of conditions that affect the lungs and their ability to function properly. Common types include asthma, chronic obstructive pulmonary disease (COPD), and pneumonia. These diseases can cause symptoms such as coughing, shortness of breath, and chest pain, impacting a person's overall health and quality of life. Many factors can contribute to lung disease, including smoking, exposure to pollutants, and genetic predisposition. Early diagnosis and treatment are essential for managing symptoms and preventing further complications. Lifestyle changes, such as quitting smoking and improving air quality, can also help maintain lung health.