Dry mouth is not a manifestation of lung cancer, the main manifestations of lung cancer are coughing, coughing up sputum, hemoptysis, emaciation and other symptoms. Dry mouth may be caused by physiological factors, as well as pathological factors such as oral diseases and chronic inflammatory diseases, etc. It is recommended to consult a doctor in time for a clear diagnosis. ⒈ physiological factors: If you eat too spicy, greasy, salty food in your diet, it is easy to have a dry mouth; if the climate is dry, the body is easy to be in a state of dehydration, it is also easy to feel a dry mouth. 2. Pathological factors: (1) oral diseases: such as mumps, oral gland stones, etc., these diseases will make the oral glands lesions, which in turn will make the saliva secretion decrease, and will also feel the symptoms of dry mouth. (2) chronic inflammatory diseases: such as dry syndrome, this disease will destroy the glands that secrete saliva, saliva secretion will be reduced, the patient will feel dry mouth. If there is persistent discomfort, it is recommended to consult a doctor in time to avoid delaying the condition if physiological factors are ruled out.