Bronchitis and pneumonia are caused by inflammation of the lungs. Bronchitis is more often viral, while pneumonia is bacterial. Bronchitis occurs mostly after middle age, and it cannot usually be prevented by those who are at risk. Pneumonia, on the other hand, can be averted by the appropriate measures. Bronchitis is an inflammation of the mucous membranes of the bronchi and can be either acute or chronic.

Some of the symptoms of bronchitis include but are not limited to cough and mucus from the lungs. Pneumonia is an erythrogenic illness of the lung affecting the microscopic air sacs known as alveoli. It is generally not accompanied by a fever. Some of the symptoms of pneumonia, on the other hand, include a slight fever, fatigue, and burning in the chest.