It is not normal to have blood in sputum after tuberculosis has been cured. Blood in sputum is usually caused by respiratory tract infection or recurrence of tuberculosis, but it can also be caused by local injury, rupture of blood vessels, tumor, etc. A variety of reasons can cause blood in sputum. In order to understand the condition of sputum, it is necessary to do relevant examinations, including sputum smear examination, blood test, chest X-ray examination, bacterial culture, etc. Patients should not eat greasy and spicy food, such as chili, white wine, onion and garlic. If you have suffered from tuberculosis and now have blood in sputum, you should be cautious about the recurrence of tuberculosis, and need to consult a doctor in time, and standardize the treatment according to the cause of the disease.