The cause of pleural effusion caused by diabetes needs to be clarified, such as pleural effusion caused by tuberculosis, which needs to be treated by lowering sugar, anti-tuberculosis, and drainage of pleural effusion if necessary. If diabetic patients with poor glycemic control and poor immunity are infected with tuberculosis, accompanied by fever, cough, chest tightness and shortness of breath, and at the same time may be complicated with pleural effusion, they need to be treated with glucose-lowering therapy and anti-tuberculosis under the guidance of a specialized doctor, and in the case of severe pleural effusion, puncture drainage may be needed. There are many reasons for pleural effusion caused by diabetes, and there may also be tumors, etc. It is necessary to consult a doctor to clarify the reasons, and it is recommended to actively treat the condition under the guidance of a doctor.