In recent years, the morbidity and mortality rates of cancer patients have been on the rise, gradually showing a trend of youthfulness. According to the national cause of death survey, among malignant tumors, lung cancer has been ranked first for many years, which is undoubtedly a “killer” ravaging the world. If we understand some basic knowledge of cancer and learn some methods to prevent and cure cancer, we will no longer be afraid of cancer. Classification of Lung Cancer By histology: Lung cancer can be simply divided into two basic types: small cell lung cancer (SCLC) and non-small cell lung cancer (NSCLC). According to the classification of anatomical sites, lung cancer can be divided into: 1. Central lung cancer: the cancer that occurs above the segmental bronchus to the main bronchus is called the central type, which accounts for about 3/4 of the total, and squamous epithelial cell carcinoma and small cell undifferentiated carcinoma are more common. Peripheral lung cancer: tumors occurring below the segmental bronchus are called peripheral type, accounting for about 1/4 of the cases, and adenocarcinoma is more common. Clinical manifestations of lung cancer 1: About 95% of lung cancer cases present clinical symptoms, but they are relatively mild and atypical, easily neglected by patients and clinicians. 2. 2. The clinical manifestations of lung cancer are closely related to the location and size of the tumor, whether it oppresses and infringes on the neighboring organs, and whether it has metastases. 3. Early stage mainly manifests symptoms of the respiratory system, the most common of which are cough, hemoptysis and chest pain. There are 5%~15% of patients who are asymptomatic when discovering lung cancer, especially peripheral lung cancer may not show any symptom in the early stage, and it is only found when X-ray examination of lungs is carried out. Lung cancer prevention There are three levels of lung cancer prevention system: 1. The first level of prevention is to change life habits. Internationally, lung cancer has a “320” high-risk group. The “320” refers to people who are younger than 20 years old, smoke more than 20 cigarettes a day, and have smoked continuously for more than 20 years, and those who fulfill these three conditions at the same time belong to the high-risk group. Therefore, primary prevention is to quit smoking. Secondary prevention is early diagnosis and treatment. Those who meet one of the “320” need to be more vigilant. If there are symptoms such as persistent cough, blood in sputum, chest pain, and tightness of breath, they should pay high attention to it, and have timely examination to see if it is lung cancer. Tertiary prevention is to prevent recurrence after treatment. To prevent recurrence, it is necessary to have regular medical checkups once a year and once every half a year for those with chronic diseases. Some people think that cancer is an “incurable disease” and resist it passively or even give up treatment; some people think that medical science is unable to resist cancer and thus give up treatment. In fact, the World Health Organization (WHO) has pointed out that one-third of cancers can be prevented, another one-third of cancers can be prolonged or even cured through treatment, and the remaining one-third of cancers can be relieved through treatment. Lung cancer treatment is based on the patient’s physical condition; the pathological type of tumor, the scope of invasion and the development tendency, applying the existing treatments reasonably and systematically, with a view to improving the cure rate and the patient’s quality of life more substantially. Early stage patients should be operated as soon as possible after diagnosis, and the cure rate can reach more than 95% or even completely cured; for advanced lung cancer, stratified integrated treatment should be adopted. Central lung cancer adopts bronchoscopic treatment as the main treatment plan, while peripheral lung cancer adopts image-guided percutaneous puncture treatment as the main treatment plan.