Major diseases of the respiratory system. Viral infections of the respiratory system; Bacterial infections of the respiratory system. Pneumonia; Legionnaires disease; Pneumonia in immunocompromised persons; Tuberculosis; Q fever; Allergic lung diseases. Asthma; Hay fever; Hypersensitivity pneumonitis; Acute diseases of the bronchi. Acute bronchitis; Bronchiolitis

Certain bacteria, viruses, and fungi are pathogens of the respiratory system. The common cold and flu are caused by viruses. Tuberculosis, whooping cough, and acute bronchitis are caused by bacteria. The pathogens that cause colds, flu, and TB can be passed from person to person by coughing and sneezing. Air pollution is another significant cause of respiratory disease.

Respiratory system involvement in cystic fibrosis is the leading cause of morbidity and mortality.

Respiratory disease, any of the diseases and disorders of the airways and the lungs that affect human respiration. Diseases of the respiratory system may affect any of the structures and organs that have to do with breathing, including the nasal cavities, the pharynx (or throat), the larynx, the trachea (or windpipe), the bronchi and bronchioles, the tissues of the lungs, and the respiratory muscles of the chest cage.

Causes of Respiratory Diseases Allergies Weak immune system Climatic conditions Extreme air pollution Exposure to excess smoke and poisonous material, harsh chemicals, dust, and pollen, etc Genetic reasons Poor development of the lungs before birth or during childhood Nutritional as well as social ...