直肠出血可以是指从肛门流出的任何血液，尽管通常认为直肠出血是指下结肠或直肠的出血。直肠是大肠的下部。
直肠出血会在您的粪便、厕纸或马桶上留下血液。直肠出血引起的血液通常是鲜红色，但偶尔可能是深褐红色。
请拨打 911 或寻求紧急医疗协助
如果您出现明显的直肠出血和任何休克迹象，请寻求急救：
- 浅快呼吸
- 站起身后感觉头晕或头重脚轻
- 视力模糊
- 昏厥
- 意识模糊
- 恶心
- 皮肤冰凉、黏湿、苍白
- 尿量少
请立即就医
如直肠出血属以下情况，请叫他人开车送您去急诊室：
请安排就医
如果您的直肠出血持续超过一天或两天，请与医生约诊；如果出血令您担心，可以更早联系医生。
显示参考文献
- Strate L. Etiology of lower gastrointestinal bleeding in adults. https://www.uptodate.com/contents/search. Accessed Jan. 16, 2020.
- Gastrointestinal bleeding. National Institute for Diabetes and Digestive and Kidney Diseases. https://www.niddk.nih.gov/health-information/digestive-diseases/gastrointestinal-bleeding. Accessed Jan. 16, 2020.
- Understanding minor rectal bleeding. American Society for Gastrointestinal Endoscopy. https://www.asge.org/home/for-patients/patient-information/understanding-minor-rectal-bleeding. Accessed Jan. 16, 2020.
- Innes JA, et al., eds. The gastrointestinal system. In: MacLeod's Clinical Examination. 14th ed. Elsevier. 2018. https://www.clinicalkey.com. Accessed Jan. 16, 2020.
Original article: https://www.mayoclinic.org/zh-hans/symptoms/rectal-bleeding/basics/when-to-see-doctor/sym-20050740