Bloody foamy sputum is a foamy sputum containing a large amount of blood. The sputum is red in color. Large amount of foamy sputum can be seen in pulmonary aspergillosis (sputum can smell like wine); pink foamy sputum is seen in pulmonary edema, etc. Chronic lung abscess, bronchiectasis, etc. can also have foamy sputum. What are the prevention methods of hemorrhagic foamy sputum? I. Prevention of bronchial diseases: 1. Quit smoking is an important measure to prevent chronic bronchitis. 2, control occupational or environmental pollution to avoid dust, smoke and harmful gas inhalation. 3, strengthen exercise, enhance physical fitness, improve immunity and cold tolerance to prevent colds and respiratory infections. Injections of influenza vaccine, streptococcus pneumoniae vaccine, etc., may be of some significance in the prevention of susceptible persons. 4, regular monitoring of lung function early detection of airflow restriction and timely measures are also very important. 5, strengthen health education, improve working conditions and hygiene habits and increase nutrition can play a positive role in the prevention of chronic bronchitis. 6, to strengthen personal hygiene, to avoid exposure to various triggering factors and inhalation. Second, the prevention of lung diseases: antibodies appear late after viral infection and have little effect on the control of infection. Interferon has a protective effect against viral infection in susceptible cells and has the effect of stopping the development of the disease and preventing its spread. Cellular immunity has a controlling effect on certain viruses, such as leukemia or Hodgkin’s disease in which cellular immunity is deficient and susceptible to rash and varicella spp. viruses, but not to other viruses. At present, the country has been widely vaccinated with live attenuated measles vaccine for infants and children, measles is now extremely rare, measles pneumonia is even rarer. Passive immunization with human immunoglobulin (protein supplement products, protein supplement information) has a protective effect on susceptible patients, especially against chickenpox and measles. Specific immunization against influenza, adenovirus and measles is protective but does not completely prevent attacks. Prevention of symptoms of hemoptysis due to mitral stenosis in cardiovascular disease: 1. intramuscular injection of benzathine penicillin G: the commonly used regimen is the long-acting penicillin preparation benzathine penicillin G 1.2 million U, intramuscular injection, once every 4 weeks. In countries and regions with a high prevalence of acute RF, as well as high-risk patients, it is best to intramuscular injection once every 3 weeks. 2, oral antibiotics: RF recurrence risk is low in patients, such as those who have reached late adolescence or young adulthood or at least 5 years without rheumatic fever recurrence, can be changed to oral antibiotics for prevention, according to the following recommended dose: ① sulfadiazine: weight > 27kg, dose 1.0g, 1 time / d. Weight ≤ 27kg, 0.5g / d. Side effects are mild and rare, occasionally lead to leukopenia, appropriate Blood count should be checked once every 2 weeks. Contraindicated in patients in late pregnancy because sulfadiazine can cross the placental barrier and compete with bilirubin in the fetus for albumin binding sites. Penicillin V: 250mg, 2 times/d. Allergic reactions are the same as with intramuscular penicillin, and penicillin skin test is recommended before use. ③Erythromycin: 250mg, 2 times/d, for those with allergy to both penicillin and sulfonamides. ④Chinese medicine, such as honeysuckle, scutellaria, scutellaria baicalensis, cypress, dandelion, panax quinquefolium, and thorny root; Chinese medicine, such as Yinhuang tablets, Yinjia tablets, anti-inflammatory spirit tablets, and Yinhuang needles, are effective for hemolytic streptococcal infections and can be applied selectively.