The following manifestations should be considered as possible tuberculosis and further sputum and chest X-ray should be performed. It should be noted that about 20% of patients with active TB may also be asymptomatic or have only mild symptoms. 1. Cough and sputum for three weeks or more, which may be accompanied by hemoptysis, chest pain, dyspnea, etc. 2, fever (often low fever in the afternoon), may be accompanied by night sweats, fatigue, reduced appetite, weight loss, menstrual disorders. Allergic manifestations caused by tuberculosis metaplasia: erythema nodosum, vesicular conjunctivitis and tuberculosis rheumatism, etc. 4, tuberculin skin test: China is a highly endemic country for tuberculosis, children are generally vaccinated with BCG, a positive test is not significant for the diagnosis of tuberculosis, but for children who have not been vaccinated with BCG, it indicates that they have been infected with Mycobacterium tuberculosis or have active tuberculosis in their bodies. When the test is strongly positive, it indicates that the body is in a hypersensitive state and has a high chance of developing tuberculosis, which can be used as a reference indication for clinical diagnosis of tuberculosis. 5, when suffering from tuberculosis, the lung signs are often not obvious. When the lung lesion is more extensive, there may be corresponding signs, and small and medium-sized blistering sounds may be heard when there is obvious cavitation or complication of bronchial dilatation. The narrowing of the canal of Coney suggests a lesion in the lung apex.