There are many forms of pneumonia and the disease generates different symptoms depending on its origin. Pneumonia generally affects both lungs and involves infection, irritation and swelling. Sometimes only one pulmonary lobe may be affected, in which case the disease is not very serious. Sometimes pneumonia affects only the upper pulmonary region (bronchial area), while in some cases the disease affects the entire region of the lungs. There can be many factors that contribute to the development of pneumonia. When the disease is caused by infectious agents, the disease is more serious and requires medical treatment. The forms of pneumonia that dont involve infection (aspiration pneumonia) usually dont require any medications and they clear up within a few days or weeks.
Pneumonia can be either typical or atypical. Typical pneumonia is caused by infection with common viruses (influenza, herpes simplex virus, varicella-zoster, adenovirus, respiratory syncytial virus), infection with gram-positive bacteria (Streptococcus pneumoniae, Staphylococcus aureus, Streptococcus pyogenes) or infection with gram-negative bacteria (Haemophilus influenzae, Klebsiella pneumoniae,...
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