It is impossible to determine the stage of lung cancer by coughing up blood. Lung cancer patients may have symptoms of coughing up blood in every stage. The specific clinical stage needs to be combined with imaging examination and pathology examination. When cancer cells invade blood vessels, the blood vessels will rupture and lung cancer patients will cough up blood. Lung cancer patients may cough up blood in early, middle and late stages. If lung cancer patients have coughing up blood accompanied by chest pain, hoarseness, difficulty in swallowing and other symptoms, it is mostly considered to be caused by metastasis of lung cancer, and generally suspected to be in middle or late stage of lung cancer. If patients have symptoms such as coughing up blood and chest pain, they should go to hospital for examination. Patients can undergo imaging examination, which can clearly see whether the tumor has metastasis in cranial brain, lymph nodes and other tissues. In addition, patients can also have pathology examination to determine the degree of metastasis. When lung cancer patients have the symptom of coughing up blood, they can not judge how many stages they are in. It is suggested that patients should go to the hospital for regular examination, and doctors will judge the specific stage according to the symptoms and examination results.