The difference between pharyngitis cough and lung cancer cough lies in: 1. The duration of symptoms is not the same, pharyngitis cough often occurs in acute attack of chronic pharyngitis, which usually lasts for a few days and can be relieved soon, while lung cancer cough often has recurrent episodes, which lasts for months and is difficult to be relieved by itself. 2. The nature of cough is not the same, pharyngitis cough has a softer tone and occurs paroxysmically, while lung cancer cough is often irritating, and typical lung cancer cough is high-pitched with metallic sound. 3. Typical lung cancer cough is high-pitched with metallic sound.3. Different accompanying symptoms: pharyngitis cough is often accompanied by sore throat, itchy throat, coughing up sputum, and mostly white sputum, and the examination can see redness and swelling of pharynx and enlarged tonsils, whereas lung cancer cough is mostly irritating and dry without sputum, and there is no redness and swelling of pharynx in general.4. Different response to treatment: pharyngitis cough can be relieved soon after throat clearing and laryngitis treatment, whereas lung cancer cough is hard to be relieved, and lung cancer cough can be relieved without clearing throat and laryngitis treatment. In short, there is a big difference between the cough caused by two kinds of diseases, as long as you go to the hospital, it is not difficult to distinguish.