The number of days it takes to extract a pleural effusion is determined by the underlying cause, and it usually takes about 1-7 days to extract a pleural effusion. In common chest trauma, pleural effusion caused by rib fracture, only the residual pleural fluid needs to be drained out, and the extraction can be completed in about 1 day. If a tuberculous pleural effusion is withdrawn, the duration depends on the duration of effective treatment of the tuberculous pleural effusion and is usually about 3 days. If there is pleural effusion caused by heart failure, pleural effusion caused by malignant tumors such as lung cancer requires a longer treatment time, usually about one week. It is effective in suppressing malignant pleural effusion or cancerous pleural effusion, and the pleural effusion will gradually improve after the heart failure improves. The time needed to withdraw pleural fluid depends on the specific cause, and normally takes about a week. When the above symptoms occur, you should go to a regular hospital for systematic examination, and implement specific measures to extract the fluid according to the specific examination results.