A dry cough that turns into a productive cough is not necessarily an improvement, and since it is not possible to judge the progress of the disease by its symptoms, it is advisable to consult a doctor promptly. If the symptoms change from a dry cough to a productive cough, it does not necessarily mean that the disease is getting better. For example, in some infectious diseases of the lungs, the initial symptom is a dry cough, which gradually changes to coughing up sputum, which may be due to further aggravation of the infection, resulting in increased secretions in the lungs, and the emergence of coughing up sputum. It is not possible to determine the progression of the disease by symptoms, and systematic tests, such as lung X-ray, blood test, sputum culture, C-reactive protein, etc., are needed to determine the stage of the disease. Therefore, it is recommended to consult a doctor to confirm the diagnosis of the disease under the guidance of the doctor, and at the same time, follow the doctor’s instructions to carry out tests in order to clarify the specific course of the disease.