Pleurisy is inflammation of the tissue (pleura) between the lungs and ribcage.
In some cases, pleurisy causes a build-up of excess fluid around the lungs called pleural effusion. Most cases of pleurisy are caused by a virus, such as the flu virus.
Treatment for pleurisy usually involves relieving the pain and, in some cases, treating the underlying cause.
The pain may be worse when you cough, sneeze or move around. It may be relieved by taking shallow breaths.