Small cell lung cancer, one of the basic types of lung cancer, is an undifferentiated cancer with pathological types including oat cell type, intermediate cell type and compound oat cell type. One-third of lung cancer patients belong to this type. Small cell lung cancer is a highly malignant tumor with poor biological behavior and an aggressive prognosis. Small cell lung cancer has a shorter symptomatic period before diagnosis and a shorter survival period after diagnosis than other types of lung cancer when compared with the same extent of dissemination. Survival period of small cell lung cancer: The medical community has not been able to reach a definite conclusion on the survival period of small cell lung cancer patients. First of all, small cell lung cancer is a systematic concept, and no identical cases have ever occurred, so no horizontal analogy can be made. Secondly, the survival cycle of small cell lung cancer is determined by the patient’s condition, and the individual differences of patients determine the survival cycle of small cell lung cancer. The improvement of the patient’s physical function is an important factor in determining the survival of small cell lung cancer in late stage. The patient’s excellent physical function and powerful immune system are sufficient to resist the expansion or continuous metastasis of the tumor. Finally, the progress of small cell lung cancer treatment is also an important factor to determine the survival period of patients. The root of the treatment actually depends on the patient’s own immune ability. Patients with strong immune ability can also better tolerate the treatment of various chemical agents. Therefore, the key to the treatment of small cell lung cancer patients lies in how to enhance the immunity of the body. Early symptoms of small cell lung cancer: Like non-small cell lung cancer, the symptoms of small cell lung cancer are not obvious in the early stage of development. When common lung cancer symptoms appear, it often indicates that small cell lung cancer is already in progress, mainly related to factors such as tumor site, size, stage, and the presence of metastasis. Small cell lung cancer is fast developing and more difficult to treat. One should be alert to the symptoms of small cell lung cancer and try to get early diagnosis and treatment. Small cell lung cancer is one of the more malignant types of lung cancer and is clinically characterized by short multiplication time of tumor cells, rapid progression and often accompanied by endocrine abnormalities or carcinoid syndrome. Clinically, most patients with small cell lung cancer are already in advanced stage when diagnosed. Diagnostic methods of small cell lung cancer: 1. Chest fluoroscopy and radiographs, which show variable round shadows and pneumonia, pulmonary atelectasis, pleural effusion, etc. Chest tomography X-ray, CT and MRI examination can understand the relationship between the size of tumor and lung lobes, lung segments and bronchi. If necessary, bronchial iodine oil imaging can be performed. 2.Checking cancer cells in sputum repeatedly can get positive results and has the value of confirming the diagnosis. 3.Bronchoscopy can directly observe the lesion, while biopsy and smear of bronchial secretion can be taken to check cancer cells. 4.If lung puncture is accurately positioned, smear examination of the punctured material can generally obtain positive results, which is of confirmatory value. 5.Superficial lymph node aspiration or biopsy: When lung cancer with lung lesions yet to be confirmed or accompanied by widening of the upper mediastinum, lymph nodes palpable on the neck and clavicle, subcutaneous suspicious masses, and other parts of suspicious cancerous lymph nodes can be aspirated for cellular examination or biopsy to obtain pathological histological confirmation of the diagnosis. Prevention of small cell lung cancer: For the prevention of small cell lung cancer, immunomodulatory and anti-tumor Chinese medicines, such as ginsenoside Rh2, can be taken to improve the function of immune system, inhibit the growth and spread of cancer cells, induce apoptosis and reverse the abnormal differentiation of cancer cells, which can reduce the incidence of small cell lung cancer if taken consistently. In addition, eating more foods with anti-tumor effects in daily life, such as: citrus, hawthorn, kelp, seaweed, sardines, celery, capers, dasheen, etc., can also play a role in preventing the development of small cell lung cancer. In addition, by maintaining reasonable dietary habits in daily life and doing more physical exercise to enhance immunity, it can also prevent small cell lung cancer.