Occult blood

Template:Search infobox Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Luke Rusowicz-Orazem, B.S.

Overview

Occult blood is blood in the feces in amounts that cannot be seen by the eye however it can be detected through tests.

Causes

Life Threatening Causes

• Carcinoma
• Erosive gastritis
• Gastric carcinoma
• Gastrointestinal trauma
• Gastrointestinal tumor
• Infections
• Neoplasia
• Portal hypertension
• Tuberculous enterocolitis

Common Causes

• Anal fissures 
• Angiodysplasia of the colon
• Angioectasia
• Aortoenteric fistula
• Cameron lesions
• Celiac sprue
• Colon polyps
• Crohn's disease
• Dieulafoy lesions
• Diverticula
• Duodenal ulcer
• Erosive gastritis
• Esophageal varices
• Gastric antral vascular ectasia
• Gastric carcinoma
• Gastric ulcer
• Gastrointestinal trauma
• Gastrointestinal tumor
• Hemorrhoids 
• Hiatal hernia
• Inflammatory bowel disease
• Intestinal polyposis
• Meckel’s diverticulum
• Oropharyngeal
• Plummer-vinson syndrome
• Reflux esophagitis
• Small bowel varices
• Ulcerative colitis
• Vascular ectasia
• Whipple disease

Causes by Organ System

Cardiovascular	Angiodysplasia of the colon, Arteriovenous malformation, Gastric antral vascular ectasia, Malignant atrophic papulosis, Portal hypertension, Vascular ectasia
Chemical/Poisoning	No underlying causes
Dental	No underlying causes
Dermatologic	Hereditary hemorrhagic telangiectasia
Drug Side Effect	Nsaids
Ear Nose Throat	No underlying causes
Endocrine	Amyloidosis
Environmental	No underlying causes
Gastroenterologic	Anal fissures , Angiodysplasia of the colon, Angioectasia, Aortoenteric fistula, Cameron lesions, Celiac sprue, Colon polyps, Crohn's disease, Dieulafoy lesions, Diverticula, Duodenal ulcer, Erosive gastritis, Esophageal varices, Gastric antral vascular ectasia, Gastric carcinoma, Gastric ulcer, Gastrointestinal trauma, Gastrointestinal tumor, Hemorrhoids , Hiatal hernia, Inflammatory bowel disease, Intestinal polyposis, Meckel’s diverticulum, Oropharyngeal, Plummer-vinson syndrome, Reflux esophagitis, Small bowel varices, Ulcerative colitis, Vascular ectasia, Whipple disease
Genetic	Ehlers-danlos syndrome, Meckel’s diverticulum, Pseudoxanthoma elasticum
Hematologic	Epistaxis, Hemangiomas, Hematobilia, Hemoptysis, Hereditary hemorrhagic telangiectasia , Plummer-vinson syndrome
Iatrogenic	Gm-csf therapy
Infectious Disease	Amebiasis, Ascariasis, Hemosuccus entericus, Hookworm, Kaposi sarcoma , Strongyloidiasis, Tuberculous enterocolitis
Musculoskeletal/Orthopedic	No underlying causes
Neurologic	No underlying causes
Nutritional/Metabolic	No underlying causes
Obstetric/Gynecologic	No underlying causes
Oncologic	Blue rubber bleb nevus syndrome, Carcinoma , Colon polyps, Gastric carcinoma, Gastrointestinal tumor, Hemangiomas, Inherited polyposis syndromes , Kaposi sarcoma , Mass lesions, Neoplasia
Ophthalmologic	No underlying causes
Overdose/Toxicity	No underlying causes
Psychiatric	Factitious
Pulmonary	Hemoptysis, Loeffler's syndrome, Tuberculous enterocolitis
Renal/Electrolyte	No underlying causes
Rheumatology/Immunology/Allergy	Amyloidosis, Celiac sprue, Crohn's disease
Sexual	No underlying causes
Trauma	Anal fissures , Cameron lesions, Dieulafoy lesions, Fissures, Gastrointestinal trauma, Hemorrhoids , Hiatal hernia, Prolonged running, Ulcers
Urologic	No underlying causes
Miscellaneous	Idiopathic cecal ulcer

Causes in Alphabetical Order

• Amebiasis
• Amyloidosis
• Anal fissures 
• Angiodysplasia of the colon
• Angioectasia
• Aortoenteric fistula
• Arteriovenous malformation
• Ascariasis
• Blue rubber bleb nevus syndrome
• Cameron lesions
• Carcinoma
• Celiac sprue
• Colon polyps
• Crohn's disease
• Dieulafoy lesions
• Diverticula
• Duodenal ulcer
• Ehlers-danlos syndrome
• Epistaxis
• Erosive gastritis
• Esophageal varices
• Factitious
• Fissures
• Gastric antral vascular ectasia
• Gastric carcinoma
• Gastric ulcer
• Gastrointestinal trauma
• Gastrointestinal tumor
• Gm-csf therapy
• Hemangiomas
• Hematobilia
• Hemoptysis
• Hemorrhoids 
• Hemosuccus entericus
• Hereditary hemorrhagic telangiectasia
• Hiatal hernia
• Hookworm
• Idiopathic cecal ulcer
• Infections
• Inflammation
• Inflammatory bowel disease
• Inherited polyposis syndromes
• Intestinal polyposis
• Kaposi sarcoma
• Loeffler's syndrome
• Malignant atrophic papulosis
• Mass lesions
• Meckel’s diverticulum
• Neoplasia
• Nsaids
• Oropharyngeal
• Plummer-vinson syndrome
• Polyposis syndromes
• Portal hypertension
• Prolonged running
• Pseudoxanthoma elasticum
• Reflux esophagitis
• Small bowel varices
• Strongyloidiasis
• Tuberculous enterocolitis
• Ulcerative colitis
• Ulcers
• Vascular ectasia
• Whipple disease

Related Chapters

Gastrointestinal bleeding

References

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