人们可能因各种肺部状况而咳血。血液可能呈鲜红色或粉红色并含有泡沫。也可能混有黏液。从下呼吸道咳血也称为咯血。
咳血，哪怕只是少量咳血，也可能令人担心。不过，痰中带有少量血迹并非罕见，通常也不是严重问题。但如果您经常咳血或大量咳血，请拨打 911 或寻求急救护理。
如果您出现咳血，请致电医疗护理专业人员。医疗护理专业人员可以确定其原因是轻微还是较严重。如果您咳出大量血或者血流不止，请拨打 911 或当地急救电话。
显示参考文献
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Original article: https://www.mayoclinic.org/zh-hans/symptoms/coughing-up-blood/basics/when-to-see-doctor/sym-20050934