Tuberculosis is not necessarily contagious, tuberculosis is transmitted through the respiratory tract and other means, tuberculosis patients should pay attention to prevention, control and treatment. Tuberculosis is a chronic infectious lung disease formed by Mycobacterium tuberculosis infection of the human body, and it is contagious when the sputum of tuberculosis patients is positive for Mycobacterium tuberculosis. When a TB patient is sputum Mycobacterium tuberculosis negative, it is not infectious. TB spreads mainly through respiratory droplets. When TB sneezes, talks, coughs and other activities, microdroplets of Mycobacterium tuberculosis are dispersed from the respiratory tract into the air and remain there for several hours, which can cause infection when inhaled by a normal person who shares a space with a person with TB. In addition, TB can be spread through the digestive tract and wound infections. It is recommended that TB patients need to wear a good mask in their daily life, do a good job of prevention and control to reduce the spread of TB, and go to a regular hospital in a timely manner.