Hemoptysis caused by lung tumor is mostly due to invasive tumor, which leads to blood vessel rupture and bleeding, if small blood vessel can be stopped after active treatment, the severity of this case is light, if large blood vessel rupture can cause asphyxiation, shock and so on, which is more serious. Hemoptysis caused by lung tumor is mostly seen in malignant tumor, such as invasion of small blood vessels in lung, after active treatment can achieve temporary hemostasis, this situation is not serious, but if not actively treated can form chronic blood loss, accompanied by dizziness, fatigue, poor mental health and other discomforts, resulting in serious consequences. If lung tumor causes local rupture of large blood vessels, asphyxia and hemorrhagic shock can be formed, which is directly threatening to life and requires urgent interventional surgery. When hemoptysis occurs in patients with lung tumor, it is recommended to go to regular hospitals in time and listen to professional doctor’s opinion.