Frequent cold and cough require physical examination, laboratory tests, imaging tests, respiratory physiological function measurement. 1. Physical examination: upper respiratory tract infections are often accompanied by fever, enlarged tonsils, etc., so we should check whether there are changes in vital signs such as fever, check whether there are enlarged tonsils and lymph nodes, auscultation of the lungs with or without abnormal respiratory sounds, coughing and sputum patients often have pulmonary wet rales. 2. Laboratory examination: blood routine of those who are infected can see the increase of neutrophils, sputum smear can find fungi, bacteria, Mycobacterium tuberculosis, cancer cells, schistosoma eggs, amebic trophozoites and so on, which can be a clear diagnosis. 3. Imaging performance: it is a common examination for lung diseases, including X-ray chest film, chest CT examination, etc. It can observe whether there are shadows in the lungs or not, and whether there are mediastinal lymph node enlargement. 4. Measurement of respiratory physiological function: through its measurement, we can understand the nature and degree of lung function damage caused by respiratory diseases, which is of great value for the early diagnosis of certain lung diseases. Patients with frequent colds and coughs are advised to go to the hospital in time to clarify the cause of the disease and under the guidance of the doctor for treatment.