Pneumonia simply means a chronic or acute inflammation of the lungs caused by a virus, bacteria, and other types of micro-organisms. Pneumonia is in three stages, mild, moderate, and severe pneumonia. Mild pneumonia occurs at the early stage of the condition. At this point, you don't feel too much pain. You can only be seeing symptoms like cough, general body pain, fever, expectoration, weakness, and others. The second level is moderate pneumonia.
This occurs when pneumonia at the mild level is left unattended to. The condition becomes a little bit complex, and different kinds of symptoms that are more severe than what mild pneumonia produces. Oxygen content in the body is reduced during moderate pneumonia. Pneumonia is not life-threatening at this stage. Severe pneumonia, on the other hand, is when the condition has deteriorated to something that cannot be controlled very easily. The patient experiences more severe pain compared to what moderate pneumonia produces.