Whether diabetes mellitus with tuberculosis is infectious depends on the condition of the patient’s lung lesions. In addition, whether the patient’s sputum is positive for antacid bacilli, if the patient’s lungs show cavity-like changes and the coughing up of sputum is also positive for antacid bacilli, it means that tuberculosis is currently in the acute infectious stage and should be isolated. In addition to anti-tuberculosis treatment, patients generally need to take insulin to enhance blood sugar control because improved blood sugar control is also beneficial to tuberculosis control.