Microinvasive lung adenocarcinoma usually has no obvious manifestation in the early stage, which is usually a lung nodule found during physical examination, and obvious symptoms may appear only when lung cancer develops to a certain degree, mainly cough, hemoptysis, fever, dyspnea and other manifestations. 1. Cough: the most common symptom of patients with micro-invasive lung adenocarcinoma is cough, most of which is irritating dry cough, some patients don’t have sputum, and some patients will have a little white mucus sputum. 2. Hemoptysis: some data show that 40% of patients will have the symptom of hemoptysis, which is usually found in sputum. 3. Fever: if the tumor tissue is necrotic, it will lead to fever, which is intermittent and mainly low and moderate. 4. Difficulty in breathing: some patients with lung adenocarcinoma will also have the symptom of dyspnea, which is mainly manifested as chest tightness, shortness of breath, chest pain and so on. The specific manifestation of micro-invasive lung adenocarcinoma varies from person to person, and it is related to the location and size of the cancer cells, etc. If the above symptoms occur, it is recommended to consult doctor in time for early diagnosis and treatment.