Tuberculosis is an infectious disease mainly caused by Mycobacterium tuberculosis infection, and droplet transmission is the most important way of transmission. Patients with the following symptoms and signs can be suspected of TB and should go to the hospital in time to improve the examination. If TB is confirmed, active treatment is required under the guidance of a doctor: 1. Initially, the cough is mild and manifests as a dry cough or coughing up a small amount of mucus sputum. Increased sputum often indicates cavity formation in the lung, and purulent sputum indicates combined bacterial infection. Irritant cough often occurs when combined with bronchial tuberculosis; 2. Coughing up blood: about 1/3 of patients can have hemoptysis, but most of them have a small amount of hemoptysis, which generally means that the hemoptysis does not exceed 100 ml in 24 hours or shows blood in sputum, and a few patients have hemoptysis, that is, the amount of hemoptysis exceeds 100 ml in one hour and the hemoptysis exceeds about 500 ml in 24 hours; 3. Chest pain: when the lesion involves the pleura, it can appear pleuritic chest pain, aggravated by respiratory movements and coughing; 4. dyspnea: mostly seen in patients with caseous pneumonia and massive pleural effusion. Among them, caseous pneumonia is more common in pediatric primary tuberculosis; 5, systemic symptoms: fever is the most common, manifested as afternoon flashes in which the body temperature starts to rise in the afternoon or evening and returns to normal in the early hours of the next day. Some patients may also experience fatigue, night sweats, weight loss, loss of energy, loss of appetite, etc. Female patients may experience menstrual irregularities. The above symptoms can be detected by patients’ self-examination, and patients are recommended to go to the hospital in time to improve the examination, including physical examination, chest X-ray, CT, PPD skin test, gamma interferon release test, sputum smear and sputum nucleic acid amplification test, and fiberoptic bronchoscopy.