Dry cough of lung cancer is different from ordinary dry cough, the difference lies in the different symptoms and triggering factors accompanying dry cough. 1. Symptoms of dry cough are different: dry cough of lung cancer is often accompanied by emaciation, fever, chest tightness and even dyspnea, and some of them have bloody sputum, and the coughing symptom does not subside easily. Ordinary dry cough does not have the symptoms of body wasting, fever, chest tightness, dyspnea, bloody sputum and so on. 2. Different triggering factors of dry cough: common dry cough is caused by external factors and inflammation stimulation, for example, inhalation of irritating air will trigger or aggravate dry cough, chronic pharyngitis will cause dry cough; lung cancer dry cough is caused by lung cancer; common dry cough is often accompanied by a foreign body sensation in the throat. Ordinary dry cough is easier to cure than lung cancer dry cough. Patients with dry cough should actively consult the doctor, do not delay the condition, and do not self-medicate to avoid adverse results.