Bronchitis is a respiratory disease that usually occurs due to an acute respiratory infection or cold, and is caused by bacteria. Bronchitis is the inflammation of the lining of the bronchial tubes. These tubes contract when they become inflamed, causing difficulty in breathing and a general feeling of discomfort. Acute bronchitis is contagious and usually goes away in the period of a few days, or up to two weeks. Chronic bronchitis usually occurs in smokers and can last for months or even years.
Pneumonia is an infection of one or both lungs. Many germs, such as bacteria, viruses or fungi, can cause it. It can also develop when you inhale liquids or chemicals. People with greater risk are elderly over 65 years of age, or under two years, or those who have other health problems.