Bronchial lung cancer can be divided into central type lung cancer and peripheral type lung cancer according to the anatomical type, and hemoptysis symptoms are mostly seen in central type lung cancer. The central type lung cancer refers to lung cancer that occurs in the segmental bronchus to the main bronchus. Hemoptysis symptoms are classified as: 1. blood in sputum, small amount of hemoptysis (<100ml/day). 2. moderate amount of hemoptysis (100-500ml/day). 3. large hemoptysis (one hemoptysis >200ml or hemoptysis >500ml/day);
When central type lung cancer grows into the bronchus it can cause persistent irritating cough, a small amount of bleeding is eliminated with sputum and blood in sputum appears. If the surface of the lung cancer is eroded and bleeds a lot, or if the lung cancer invades the surrounding large blood vessels, a lot of blood is discharged from the respiratory tract through the mouth, and hemoptysis occurs. If the lung cancer has a large amount of bleeding on the surface of the cachexia, or if the lung cancer invades the surrounding large blood vessels, a large amount of blood is discharged from the respiratory tract through the mouth.