Hi!
Your father is having a pleurisy(inflammation of pleura, a two-layered lining around the lung) The lining is irritated and swollen and due to this the two layers of pleura rub together when the lungs move during breathing. Sometimes, this is leading to collecting of extra fluid in the space between the pleural layers and when there is too much fluid, it is called a pleural effusion.
Fluid is usually removed and sent to laboratory for testing. Sharp pain and shortness of breath are its main symptoms. This condition can be caused by many different things: infections( pneumonia, tuberculosis); chest injury and cancer and some autoimmune diseases such as lupus or rheumatoid arthritis, some heart problems, pancreatitis. Sometimes is difficult to find the cause.
Is your father suffering from some of the mentioned conditions below?
Hope I help a bit!
Waiting for your post!
