The healing time of tuberculosis cavity is related to the immunity of the patient, the severity of the lesion, the patient’s sensitivity to drugs and other factors, and cannot be generalized. Tuberculosis cavities are formed when the infected Mycobacterium tuberculosis is more virulent and the body’s resistance is relatively low, and Mycobacterium tuberculosis multiplies in the lungs and destroys the lung tissue. If the tuberculosis cavity is small and the wall is thin, the patient is in good condition and is sensitive to anti-tuberculosis drugs, and the cavity will heal in about 3 months after treatment. Larger, thick-walled cavities usually take longer to heal, with patients needing treatment for about 6 months or even a year. In some patients, the tuberculosis cavity is absorbed to a certain extent and does not continue to shrink, eventually forming a purgative cavity. In addition, patients with tuberculosis cavities are in the active stage of the disease, and since tuberculosis is contagious, patients should pay attention to personal hygiene and not spit on the ground to avoid infecting others.