Hemoptysis is the process of bleeding from the organs below the larynx and excreting through the mouth. Clinically, hemoptysis can be divided into three categories, as follows: 1) small amount of hemoptysis: the daily amount of hemoptysis is less than 100 ml; 2) medium amount of hemoptysis: the daily amount of hemoptysis is 100-500 ml; 3) large amount of hemoptysis: the daily amount of hemoptysis is more than 500 ml, or the one-time amount of hemoptysis is 100 ml. Clinically, there are many causes of hemoptysis, the most common ones are tuberculosis, bronchiectasis The most common causes are tuberculosis, bronchiectasis, lung cancer, etc., but there are also other rare causes. If it is a small amount of hemoptysis, you can use symptomatic drugs to stop the bleeding; if it is a large hemoptysis, it is recommended to go to a regular hospital to avoid suffocation and life-threatening hemoptysis.