The differences between lung cancer and pharyngitis are different etiology, different symptoms, different examination, different treatment and prognosis. 1. Causes: The causes of lung cancer are still unclear, and the main risk factors include smoking, air pollution, occupational exposure, etc. Pharyngitis is mainly caused by pathogen infections, such as mycoplasma, virus, bacteria, etc. 2. Symptoms: Lung cancer is mainly characterized by recurrent irritating cough, sputum and hemoptysis, and in the late stage, it is accompanied by chest pain, emaciation and other symptoms of malignant disease; pharyngitis is mainly characterized by dry pharynx, itchy pharynx and foreign body sensation of pharynx, and at the same time, it will cause coughing, sore pharynx, nausea and other discomforts. 3. Examination: CT examination of lung cancer can find lung occupancy, non-smooth, burr-like and other manifestations; pharyngitis usually does not need imaging examination, and the pharynx can be seen with naked eyes to be congested, lymphoid follicle hyperplasia and other manifestations. 4. Treatment and prognosis: early detection of lung cancer can be considered surgical treatment, with adjuvant radiotherapy and prognosis examination; pharyngitis can be treated with antibiotics such as azithromycin and cefixime according to the symptoms and drug sensitivity results, which can be cured and have good prognosis. Lung cancer and pharyngitis are two different diseases, patients should consult the doctor in time for clear diagnosis and early treatment to avoid delay.