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
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Original article: https://www.mayoclinic.org/zh-hans/symptoms/coughing-up-blood/basics/causes/sym-20050934