Normal people do not get TB for no reason. Normal people usually get TB from contact with TB patients who are not properly protected. Tuberculosis is an infectious disease of the respiratory system caused by infection with Mycobacterium tuberculosis, which is mainly transmitted through droplets in the respiratory tract, and is characterized by coughing, sputum coughing, low-grade fever in the afternoon, night sweats, and lethargy. Open tuberculosis patients discharge bacteria is the main source of tuberculosis transmission, patients discharge sputum discharge Mycobacterium tuberculosis, suspended in the air, inhaled by normal people, can cause normal people infected with tuberculosis. If a normal person drinks milk and other dairy products contaminated with Mycobacterium tuberculosis, he or she can also be infected with tuberculosis through the digestive tract. Pregnant women with tuberculosis can cause mother-to-child transmission through the placenta; if normal people have low immunity, especially those who use glucocorticosteroids for a long time or undergo radiotherapy for a long period of time, due to the low immune function of the body, infection can occur after contacting Mycobacterium tuberculosis, resulting in tuberculosis. Therefore, normal people should wear masks in daily life and take good protection to avoid contact with TB patients. In terms of diet, it is necessary to pay attention to balanced nutrition and appropriate sports and exercise in order to enhance physical fitness and reduce the chances of contracting TB.