It is usually not easy to hold back the cough of lung cancer patients, but it is not possible to judge whether there is lung cancer or not based on whether it can be held back. Cough of lung cancer patients manifests as no or little sputum, irritating dry cough; cough will be aggravated after tumor-induced bronchial stenosis, which manifests as persistent cough, high-pitched metallic sound cough, irritating choking cough, and if accompanied with infection, it can manifest as increased sputum, and patients can not get good results from general cough suppressants; this kind of cough is more persistent and cannot be held back in general. Cough caused by lung cancer is often accompanied by hemoptysis, croup, chest tightness, fever, emaciation, etc. Patients should not eat greasy and too salty and spicy food, such as chili, fat meat, pickles, white wine and so on. Patients with cough of lung cancer should actively seek medical treatment, patients should not delay the condition to avoid bad results.