According to Dameshek, true polycythemia (polycythemia vera: PV) is a chronic myeloproliferative disorder of the total bone marrow without any evidence of invasiveness, in which erythrocytosis, leukocytosis, and thrombocytosis are all simultaneously present.
However, in patients suffering from connective tissue disease or lung cancer, chest pain may persist for long periods. What Causes Pleurisy? Pleurisy may occur inhealthy, young people who have an infection in the lungs caused by bacteria or virus. Pleurisy may last a few days or up to two weeks. In rare cases, the infection may spread, causing pleurisy in other people. Pleurisy may also be associated with air leaking in the pleural cavity from a punctured lung, a condition called pneumothorax.
Pleurisy means inflammation of the pleura, the membrane that covers the lungs and lines the inside of the chest cavity. Depending on its cause, pleurisy can be associated with an accumulation of fluid in the space between the lungs and chest wall called a pleural effusion, or it can be dry pleurisy, which has no fluid accumulation. Pleurisy can develop many ways, including: 1  Lung infection â In industrialized nations, bacterial pneumonia (lung infection) resulting from staphylococci, pneumococci, Haemophilus influenzae or other organisms is a frequent cause of pleurisy.