Sinusitis often results in a bad cough due to backed up nasal discharge that irritates the throat. In addition, there are other diseases that may cause a bad cough. It is recommended to visit the hospital for further examination and standardized treatment as prescribed by the doctor. Sinusitis can be caused by a large amount of nasal snot in the nasal cavity, backflow to the pharynx, throat, thereby stimulating the local mucous membrane caused by itching, coughing, coughing up phlegm, resulting in a strong cough. Sinusitis can also manifest symptoms such as runny, often purulent nose, nasal congestion, headache, and decreased sense of smell. Sinusitis can be definitively diagnosed through sinus CT and nasal endoscopy. In addition, strong cough may be caused by pneumonia, bronchitis, asthma and other respiratory diseases, while different respiratory diseases may be combined with coughing, fever, chest tightness, dyspnea and so on. You need to be examined by the respiratory medicine department of the hospital. Therefore, if you have a strong cough, you should consult a doctor as soon as possible to determine the cause of the cough and get a reasonable treatment under the doctor’s guidance.