Pneumonia is an illness in which the small air sacs
called alveoli in the lungs get infected and filled with
fluid or pus. The airways also produce extra mucus,
and it is often dark in color. Pneumonia causes
fever, cough, and difficulty breathing.
Chronic obstructive pulmonary disease, or COPD,
is a common condition seen in people who have
smoked for many years. This chronic respiratory
disease is characterized by damaged lung tissues
and exacerbations that can cause distress and
Respiratory Syncytial Virus (RSV) is a very
contagious and common respiratory virus that hits
young children the hardest. While mild cases
manifest as cold symptoms, more serious cases
cause significant inflammation in the small airways
of the lungs.