Cough is a clinical symptom that can be caused by a variety of diseases. What tests should be performed should be considered in conjunction with the history of exposure and other accompanying symptoms. 1. Tuberculosis: If the cough is accompanied by night sweats, low-grade fever, weight loss and other symptoms, chest X-ray or CT, tuberculin test, T-cell test for tuberculosis infection, sputum tuberculosis culture and other relevant examinations should be completed to determine whether it is tuberculosis. 2. Lung infection: if the cough is accompanied by high fever, fatigue, coughing up yellow sputum and other symptoms, blood routine, C-reactive protein, sputum culture and chest X-ray or CT should be perfected in order to determine whether it is a lung infection and its corresponding causative organisms. 3. Allergic cough: If the cough is irritating dry cough and caused by contact with allergens, it is mostly considered to be caused by allergy, and allergens examination and blood IgE examination can be perfected to determine whether it is an allergic cough, and allergens should be actively searched for and kept away from. 4. Asthma: If the cough is accompanied by wheezing, it is necessary to improve the lung function, bronchodilatation test, bronchial excitation test, etc., in order to determine whether it is asthma. In addition to respiratory diseases, cough can also be caused by other diseases, such as gastroesophageal reflux disease, post-nasal drip syndrome. If the cough is recurrent, it is recommended that the patient go to the hospital, improve the examination under the guidance of the doctor, clarify the cause of the disease, and follow the doctor’s instructions for treatment.