Biology

Pneumonia is an infection of the lungs that leads to inflammation and fluid accumulation in the alveoli.
Symptoms include a productive cough, fever, and difficulty breathing.
It can be caused by bacteria, viruses, or fungi.
The fluid in the alveoli, visible on a chest X-ray, is a hallmark of the condition.

Bronchitis is the inflammation of the bronchial tubes.
Acute bronchitis is usually caused by a viral infection and presents with a cough that may or may not be productive.

Asthma is a chronic inflammatory disease of the airways.
Symptoms i...