Lung Disease and Respiratory System
Diseases, pollutants and genetics can affect your respiratory health. The simple cold - which is caused by more than 200 different viruses - inflames the upper respiratory tract, resulting in a cough, runny nose and sneezing. A more severe cough combined with mucus is a sign of bronchitis, where the membranes lining the bronchial tubes become inflamed. The inflammatory lung disease asthma affects more than 20 million people, making airways constrict when exposed to irritants like dust, pet dander and cigarette smoke. Pneumonia, another inflammation of the lungs, can occur because of a bacterial or viral infection. People suffering from cystic fibrosis, an inherited lung disease, frequently battle bacterial infections and airways clogged with thick and sticky mucus.