What can be the cause for pleural effusion? the doctor diagnosed me and said it was not serious but not what could have caused it. in the blood my s uric acid was 0.42 and the rest of all the tests was normal?

More information is needed to address your concern. Pleural effusion can be from heart issues, kidney problems, infection, abdominal issues (liver, pancreas ) , cancer, inflammatory conditions, medications, childbirth. Speak to your doctor

Most commonly following pneumonia, which will led this episode self limited and isolated with a variety of other conditions possible and making the possibility of recurrence high. Your doc will remain your best reference going forward and specifically if the pleural effusion reoccurs.

Pleurisy and pleural effusion, if no cause is obvious, need to treated as tuberculosis. Your doctor can should test for tuberculosis and treat you as if you have tuberculosis, unless another explanation for the lesion emerges. Wish you good health!