Lung cancer is not an untreatable disease, but there are still some steps that need to be understood when seeking medical diagnosis, let’s take a look together. Among lung cancer patients, the first thing to understand is the patient’s condition, especially the medical history. Men who are older than 45 years old and have a smoking index greater than 400 are at high risk of lung cancer. Lung examination is recommended at least once a year. Patients with cough and bloody sputum should be highly suspected of having lung cancer. The symptoms of lung cancer are not specific and usually in two weeks cannot cure the respiratory symptoms, especially with bloody sputum, cough, or changes in the original respiratory symptoms, need to be highly alert to the possibility of lung cancer. Annual physical examination, if abnormal chest X-ray is found, such as healed fibroproliferative lesions of pulmonary tuberculosis, annual follow-up examination should be conducted, and the existence of lung scar cancer should be further excluded if the lesion increases. The specific period of the patient’s condition can be judged by the symptoms of lung cancer patients, which also has a certain diagnostic role. Lung cancer patients with headache, nausea or other neurological signs and symptoms should be considered as possible brain metastases in lung cancer patients. Bone pain and elevated blood alkaline phosphatase or blood calcium should consider the possibility of bone metastasis. Right upper abdominal pain, hepatomegaly, elevated alkaline phosphatase, glutamic transaminase, lactate dehydrogenase or bilirubin should be considered as liver metastasis. We should have certain understanding about the diagnosis of lung cancer so that we can better provide our condition to the doctor, and the doctor can formulate the most suitable treatment plan for you. Experts of the First Hospital of Hebei Medical University Oncology Center are professional oncologists in the province, and technologies such as argon-helium knife are new technologies that are highly praised.