The early sign of mild lung cancer is paroxysmal irritating dry cough with no or little sputum, and if the condition is serious, chest pain, hemoptysis and so on may occur. Usually, lung cancer patients will have cough in the early stage, which mostly manifests as irritating dry cough with no or little sputum. If the above symptoms persist, patients need to pay attention to it in time and consult doctor for relevant examination to determine the disease. At the same time, some early stage lung cancer patients may have blood in sputum, hemoptysis, hoarseness, dyspnea and so on, so they need to be alert in time. With the development of the disease, patients may also have fever, pleural fluid, superior vena cava obstruction syndrome, Horner’s syndrome, etc. They may also show bone and joint hypertrophy, asthma, hyperactivity of the heart, etc. It is suggested that patients should pay more attention to their own symptoms, and if the above symptoms appear, they should pay attention to them in time, and if it is clear that it is early stage of mild lung cancer, they should actively seek medical treatment.