Tuberculosis is a chronic infectious disease caused by Mycobacterium tuberculosis and not all patients are infectious. Generally, there are no special symptoms in the early stage of tuberculosis, but if there are unexplained symptoms such as prolonged coughing, coughing up sputum, hemoptysis, chest pain, fever, malaise, loss of appetite and emaciation, it is necessary to consider the possibility of tuberculosis. The main way of spreading TB is through respiratory droplet transmission. When a person with TB coughs, sneezes, laughs, talks and sings, he or she may spread Mycobacterium tuberculosis from the respiratory tract into the air, where it can remain for several hours and cause infection if inhaled by others. There are other ways of spreading TB, such as through the digestive tract by drinking contaminated milk, through the placenta of a pregnant woman with the disease, and through skin wounds.