多种肺部状况可能导致咳血。咳出的血液可能是鲜红色或粉红色、多泡，或者可能混有黏液。
咳血也称为咯血，即使量少，也可能让人担心。但是，咳出少许带血痰并不罕见，通常不是大碍。
如果您正在大量或频繁咳血，请拨打 911 或寻求急救护理。
如果您正在咳血，请致电您的医生。他或她可以确定是次要原因还是潜在的更严重的原因。如果您咳出大量血液或流血不止，请致电 911 或紧急医疗救助。
显示参考文献
- Weinberger SE. Etiology of hemoptysis in adults. https://www.uptodate.com/contents/search. Accessed Sept. 10, 2024.
- Ferri FF. Hemoptysis. In: Ferri's Clinical Advisor 2025. Elsevier; 2025. https://www.clinicalkey.com. Accessed Sept. 10, 2024.
- Community-acquired pneumonia. Merck Manual Professional Version. https://www.merckmanuals.com/professional/pulmonary-disorders/pneumonia/community-acquired-pneumonia?query=pneumonia. Accessed Sept. 10, 2024.
- Hemoptysis. Merck Manual Professional Version. https://www.merckmanuals.com/professional/pulmonary-disorders/symptoms-of-pulmonary-disorders/hemoptysis. Accessed Sept. 10, 2024.
- Problem: Mitral Valve Stenosis. American Heart Association. https://www.heart.org/en/health-topics/heart-valve-problems-and-disease/heart-valve-problems-and-causes/problem-mitral-valve-stenosis. Accessed Sept. 10, 2024.
- What is COPD? National Heart, Lung, and Blood Institute. https://www.nhlbi.nih.gov/health/copd. Accessed Sept. 10, 2024.
- Tuberculosis: Causes and how it spreads. Centers for Disease Control and Prevention. https://www.cdc.gov/tb/causes/index.html. Accessed Sept. 10, 2024.
- What is cystic fibrosis? National Heart, Lung, and Blood Institute. https://www.nhlbi.nih.gov/health/cystic-fibrosis. Accessed Sept. 10, 2024.
- Lung abscess. Merck Manual Professional Version. https://www.merckmanuals.com/professional/pulmonary-disorders/lung-abscess/lung-abscess. Accessed Sept. 10, 2024.
- Pulmonary embolism. Merck Manual Professional Version. https://www.merckmanuals.com/professional/pulmonary-disorders/pulmonary-embolism-pe/pulmonary-embolism-pe. Accessed Sept. 10, 2024.
- Granulomatosis with polyangiitis (GPA). Merck Manual Professional Version. https://www.merckmanuals.com/professional/musculoskeletal-and-connective-tissue-disorders/vasculitis/granulomatosis-with-polyangiitis-gpa. Accessed Sept. 10, 2024.
- Wilkinson JM (expert opinion). Mayo Clinic. Oct. 4, 2024.
Original article: https://www.mayoclinic.org/zh-hans/symptoms/coughing-up-blood/basics/when-to-see-doctor/sym-20050934