<unk> s, or lung diseases, are pathological conditions affecting the organs and tissues that make gas exchange difficult in air-breathing animals. They include conditions of the<unk>  tract including the trachea, bronchi, bronchioles, alveoli, pleurae, pleural cavity, the nerves and muscles of respiration.<unk> s range from mild and self-limiting, such as the common cold, influenza, and pharyngitis to life-threatening diseases such as bacterial pneumonia, pulmonary embolism, tuberculosis, acute asthma, lung cancer, and severe acute<unk>  syndromes, such as COVID-19.<unk> s can be classified in many different ways, including by the organ or tissue involved, by the type and pattern of associated signs and symptoms, or by the cause of the disease. The study of<unk>  is known as pulmonology. A physician who specializes in<unk>  is known as a pulmonologist, a chest medicine specialist, a<unk>  medicine specialist, a respirologist or a thoracic medicine specialist.
Respiratory disease
Panic attack
Respiratory tract infection
Birth defect
Infant mental health
Urologic disease
Liver disease
Maternal health