Question: what causes fluid around your heart and lungs?
Answer: Causes of pericardial effusion include: Inflammation of the pericardium following heart surgery or a heart attack. Autoimmune disorders such as rheumatoid arthritis or lupus. Spread of cancer (metastasis), particularly lung cancer, breast cancer, melanoma, leukemia, non-Hodgkin's lymphoma or Hodgkin's disease.