Signs and symptoms of pneumonia can vary depending on the type and severity, but they typically include: There are many different types of pneumonia — and most of them can be contagious.

Smokers are more likely to develop pneumonia. A variety of bacteria, viruses and fungi cause different types of pneumonia. These germs enter the respiratory tract though your mouth or nose.

Both bronchitis and pneumonia cause a cough that sometimes produces phlegm, a thick type of mucus that’s made in your chest. You can tell the difference between bronchitis and pneumonia by ...