The color of hemoptysis in lung cancer may be bright red because the tumor invades the small bronchial vessels of the lung, resulting in direct fresh blood, or if it is old bleeding inside, it may be partly dark red or with clots. The appearance of hemoptysis in lung cancer indicates that the lesion may develop more severely and the disease is more serious. Lung cancer is also mainly treated by surgery, but lung cancer that has developed hemoptysis is not necessarily amenable to surgery. Because early stage lung cancer does not have obvious hemoptysis, it may just have blood in sputum or no obvious symptoms. The diagnosis of lung cancer can be confirmed by lung CT to detect the occupying lesion and then further pathological examination, mainly by bronchoscopy or percutaneous lung aspiration biopsy. If lung cancer cannot be operated, other treatments such as radiotherapy, chemotherapy, and some lung cancers can be treated with targeted drugs.