If the cough persists for more than one month, chest CT, blood routine, mycoplasma and chlamydia antibodies, sputum culture and lung function test can be perfected. Coughing is a reflexive defense action that can remove secretions from the respiratory tract. Coughing frequently for a long period of time is considered to be a pathological condition, and further tests are needed to help diagnose the cause of the disease. Chest CT can detect lung tissue lesions, including pneumonia, lung cancer, pneumothorax, bronchial foreign body, tuberculosis, bronchial dilatation, etc., which can cause persistent cough discomfort. Complete blood tests can help diagnose viral or bacterial infections, etc., which can help in the diagnosis of pneumonia. Mycoplasma or chlamydia antibody tests help diagnose or rule out mycoplasma or chlamydia pneumonia. Sputum culture helps to diagnose tuberculosis, bacterial pneumonia, etc. Lung function tests can help diagnose bronchial asthma, etc. For long-term persistent cough discomfort, it is recommended to seek timely medical attention and standardize treatment under the guidance of a medical professional.