Patients with early stage lung cancer may experience coughing and sputum, which may show that there is sputum in the throat all the time. This is because the lung tumor may exert certain pressure on the normal trachea and bronchus of human body and may block the trachea and bronchus, which may lead to coughing and sputum due to the stimulation of the mucous membrane of the tissue. In general, the sputum is small, but when combined with lung infection, the sputum may appear to be increased and sticky. Another condition is small cell lung cancer, where the patient may have more sputum due to the secretory nature of the cancer cells. Therefore, if patients are diagnosed with early stage lung cancer, they should actively cooperate with doctors to receive treatment. A considerable number of patients can reach the level of clinical cure, that is, make the symptoms of pneumonia eliminated, under the principle of early diagnosis and early treatment. The best treatment method for early stage lung cancer is surgery, and the purpose of treatment is to remove the tumor as much as possible and reduce the purpose of tumor metastasis and recurrence, and the phlegm in throat all the time will be relieved. After surgery, radiotherapy or chemotherapy should also be administered according to the patient’s physical condition. The high-energy radiation of radiotherapy and the chemical drugs in chemotherapy can effectively kill cancer cells or stop their growth in order to minimize the possibility of tumor recurrence. Besides treatment, patients with early stage lung cancer should also pay attention to maintain a good state of mind in their life, face lung cancer with a positive attitude, exercise appropriately when their physical condition allows, ensure a regular life and sufficient sleep, and avoid staying in smoky or air-polluted environment to avoid bad environment stimulating the production of phlegm.