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A wide range of conditions or diseases that impair lung function are referred to as "lung diseases." Lung disease can affect both respiratory function, or the capacity to breathe, and lung function, or how well the lungs work.Numerous lung conditions are brought on by infections caused by fungi, bacteria, or viruses. Lung cancer, mesothelioma, and asthma are among the other lung diseases linked to the environment.Emphysema, persistent bronchitis, and ongoing obstructive pneumonic illness (COPD) are instances of constant lower respiratory sicknesses. The majority of deaths in the United States are caused by chronic lower respiratory conditions. In respiratory circumstances like asthma and COPD, aviation routes thin or become obstructed, lessening wind current.The lungs are less ready to hold air in other lung conditions like aspiratory fibrosis, which is a scarring of the lung tissue that can be brought about by different variables, and pneumonia, which is a bacterial or viral contamination where the air sacs load up with liquid.Lung cancer is a condition caused by abnormal cell growth. Even though most cases of lung cancer start in the lungs, some start in other parts of the body before spreading to the lungs. The two most common types of lung cancer, non-small cell lung cancer and small cell lung cancer, both grow and spread in different ways and can be treated differently.Cellular breakdown in the lungs is generally triggered by smoking cigarettes. Inhaling secondhand smoke can also raise a person's risk of getting the disease.Other environmental factors that have been linked to lung disease include asbestos, radon gas, air pollution, and chemicals like uranium, beryllium, vinyl chloride, and arsenic.