Coughing for more than two weeks does not improve the need to clarify the causes of coughing, as follows: a. Common causes include respiratory tract infections. Patients often have cold symptoms, such as coughing and coughing after runny nose and sore throat, and if they only cough up white sputum, they can take oral coughing and phlegm-relieving drugs, such as bromhexine. Second, if the cough has yellow sputum, it suggests a bacterial infection and can be treated with amoxicillin or first- or second-generation cephalosporin antibiotics against infection. C. Tuberculosis and lung tumors can cause long-term coughing, in addition to sputum and blood, lethargy, and poor appetite. Fourth, cough is also caused by upper airway cough syndrome, caused by rhinitis and chronic inflammation of the throat. If the cough does not clear up in two weeks, you need to go to the hospital for relevant tests, such as chest CT, blood count and sedimentation, to clarify the cause of the cough and then treat it symptomatically.