The amount of hemoptysis can be medically classified into three levels, the details of which are as follows: 1) small amount: within 24 h, the amount of hemoptysis does not exceed 100 ml; 2) medium amount: within 24 h, the amount of hemoptysis is between 100 ml and 500 ml; 3) large amount: within 24 h, the amount of hemoptysis exceeds 500 ml, or the one-time amount of hemoptysis is between 200 ml and 300 ml. Usually, patients with small amount of hemoptysis can be treated with Usually, patients with small amount of hemoptysis can be stopped with drugs, while patients with large amount of hemoptysis can do interventional treatment.