After being diagnosed with lung cancer, patients and family members have to face a lot of things, and they are confused to hear many unheard terms at once: small cell lung cancer or non-small cell lung cancer, PET-CT, staging, hard-to-remember names of chemotherapy drugs, targeted therapy, biologic therapy, etc. Regarding the diagnosis, treatment and recovery of lung cancer, both patients and family members should know at least the following. 1. Enhanced CT examination of chest. It is used to determine the location and size of tumor, mediastinal lymph nodes and the presence of pleural fluid. 2.Bronchoscopy or puncture. Puncture can obtain the pathological type of lung cancer (adenocarcinoma, squamous carcinoma, small cell lung cancer, etc.). Patients or family members often have doubts or fears about puncture or bronchoscopy, not knowing that the chemotherapy regimens corresponding to different pathological types are different, and if the wrong chemotherapy regimen is chosen, the treatment results will definitely be affected. Therefore, bronchoscopy or percutaneous lung aspiration is of great importance. These tests are invasive and may cause a small amount of hemoptysis, cough or low-grade fever after the procedure, which can usually resolve on its own without special treatment, or be treated symptomatically with hemostatic drugs or anti-inflammatory drugs. Many patients or family members refuse to perform these tests because they fear that puncture or bronchoscopy may cause the spread of the disease. In fact, clinical exacerbations due to such examinations are rare. On the contrary, obtaining pathological tissue not only provides a basis for chemotherapy, but also allows for further genetic analysis to see if it is sensitive to targeted drug therapy. In addition, if the pathology is clearly small cell lung cancer, surgery is usually not an option, and chemotherapy is the first choice of treatment. 3.PET-CT and abdominal ultrasound can determine the metastasis of the whole body, which is a self-financed examination and more expensive, and is the best choice to determine the whole body. Abdominal ultrasound can be used to check the liver, bile, pancreas, spleen, both kidneys and the presence of ascites, etc. It is not as accurate as CT, but it is a non-invasive examination, and there is no X-ray radiation damage. It is mostly used for regular review, and if abnormalities are found, further CT or nuclear magnetic examination should be taken. 4.Head MRI. Brain metastases are common in adenocarcinoma and small cell lung cancer in lung cancer. The accuracy of brain MRI is better than brain CT and PET-CT, so head MRI is preferred to determine whether there are brain metastases. 5.Blood routine, blood biochemistry (especially liver and kidney function), tumor markers, cardiac ultrasound, lung function, electrocardiogram, blood gas analysis, etc. should be checked before surgery and radiotherapy, in order to assess whether the patient can receive the corresponding western medical treatment and to prepare for the post-chemotherapy evaluation.