Multiple lung adenocarcinomas in both lungs may manifest as hematogenous metastasis or multiple lung adenocarcinomas in early stage. Lung adenocarcinoma originates from the epithelium of bronchial mucosa, which is peripheral lung cancer, and the cancer cells can develop hematogenous metastasis in early stage. Cancer cells will form multiple round or oval lumps in the lungs, and the growth of the lumps is usually slow. Most of the lumps will not cause typical clinical symptoms in the early stage, and they may be detected during chest X-ray examination. Multiple lung adenocarcinomas in both lungs are more common in women and long-term smokers. As the disease progresses, patients may have chest tightness, chest pain and coughing, etc. Once the diagnosis is confirmed, patients should cooperate with doctors as soon as possible to undergo thoracic surgery to remove the tumors, and chemotherapy can be implemented if necessary. After effective treatment with doctors, patients with multiple lung adenocarcinoma in both lungs should stop smoking and second-hand smoke during the recovery period.