People who have had tuberculosis can apply for a health certificate after they have recovered from the disease. Because people who have had tuberculosis are sputum-negative and only have old lesions visible on imaging, they are usually not contagious and do not have any clinical symptoms or manifestations, so they can get a health license. After reasonable and standardized treatment, the prognosis of TB patients is generally good, most of them can be cured, and the symptoms usually begin to subside after 2-3 weeks of treatment. Without reasonable treatment, the infection may worsen and spread from the lungs to other parts of the body, evolving into a disseminated disease that can even be life-threatening. If left untreated, it can lead to permanent lung damage, resulting in decreased lung function later in life and shortness of breath after activity. When the infection spreads to other organs, such as the intestines, liver, ovaries, and uterus, it can cause lesions in other organs.