Be alert to the possibility of tuberculosis when the following conditions occur: 1. Cough and sputum for more than three weeks, which may be accompanied by respiratory symptoms such as hemoptysis, chest pain, and dyspnea. 2. Fever (often low fever in the afternoon), which may be accompanied by night sweats, fatigue, decreased appetite, weight loss, and menstrual disorders. 3. Allergic manifestations caused by tuberculosis metaplasia: erythema nodosum, vesicular conjunctivitis and tuberculosis rheumatism, etc. In case of the above, you should go to the hospital to check the tuberculin test, tuberculosis antibodies, take a film, check sputum, etc. Those who are in close contact with tuberculosis should be examined regularly. Although tuberculosis cannot be diagnosed on the basis of a positive tuberculin test and tuberculosis antibody result, it has reference significance when combined with other examination results for a comprehensive judgment.