Sputum with blood or small blood clots, mostly due to the mucous membrane or lesion capillary permeability increase, blood exudation; hemoptysis, can be due to small aneurysm rupture in the respiratory tract or due to pulmonary venous hypertension endobronchial venous varices rupture. Any sputum with blood, or sputum and blood, or pure blood bright red, are called hemoptysis. Hemoptysis is both an independent symptom and a symptom of many diseases. What are the causes of hemoptysis with skin and mucous membrane bleeding? 1, bronchial diseases: such as bronchiectasis, bronchitis, endobronchial tuberculosis, bronchopulmonary carcinoma, etc.; 2, lung diseases: such as tuberculosis, pneumonia, lung tumors, pulmonary schistosomiasis, pulmonary embolism, etc.; 3, cardiovascular diseases: such as left heart failure, mitral stenosis, etc.; 4, other diseases: such as blood disorders, leptospirosis, tuberculous arteritis and so on. The mortality rate of massive hemoptysis is high, while occasional blood in sputum is easily neglected by patients and physicians due to mild symptoms, and thus must be taken seriously. Bleeding for the first time or many times, such as for many times, with the past there is no difference. Coughing and hemoptysis with low-grade fever in young adults should be considered as tuberculosis. Middle-aged people, especially male smokers should pay attention to the possibility of lung cancer; must be carefully questioned and observed hemoptysis amount of color, with or without sputum, ask personal history should pay attention to tuberculosis contact history of many years of smoking, menstruation history, occupational exposure to dust and so on.