<P> A chest x-ray takes a picture of the heart and lungs . It may show air or fluid in the pleural space . It also may show the cause (e.g., pneumonia, a fractured rib, or a lung tumor) of the pleurisy . </P> <P> Sometimes an x-ray is taken while lying on the painful side . This may show fluid, as well as changes in fluid position, that did not appear in the vertical x-ray . </P> <P> Blood tests can detect bacterial or viral infections, pneumonia, rheumatic fever, a pulmonary embolism, or lupus . </P> <P> Electrocardiography test can determine if a heart condition contributes to the symptoms . </P>

Hurts to take a deep breath on right side of chest