When inflamed, the two layers rub against each other, producing pain every time
Pleurisy can be caused by a viral infection (like the flu), a bacterial
infection (pneumonia), a lung clot, or autoimmune conditions like Rheumatoid Arthritis or Lupus.
You treat pleurisy by treating whatever is causing it. For example, if the cause of pleurisy is a bacterial infection of your lung (pneumonia), then you may need antibiotics to get rid of it.