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Gastrointestinal Bleeding – Causes and Treatment

Gastrointestinal bleeding refers to any bleeding that occurs within the digestive tract, from the esophagus to the rectum. It can range from mild to life-threatening and requires prompt medical evaluation.

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Things worth knowing about "Gastrointestinal Bleeding"

Gastrointestinal bleeding refers to any bleeding that occurs within the digestive tract, from the esophagus to the rectum. It can range from mild to life-threatening and requires prompt medical evaluation.

What Is Gastrointestinal Bleeding?

Gastrointestinal (GI) bleeding refers to any bleeding that occurs along the digestive tract, which extends from the mouth to the anus. It is classified as either upper GI bleeding (originating in the esophagus, stomach, or duodenum) or lower GI bleeding (originating in the small intestine, colon, or rectum). GI bleeding is a common medical emergency that ranges from mild, chronic blood loss to sudden, life-threatening hemorrhage. Early identification and treatment are essential to prevent serious complications.

Causes

The underlying causes of GI bleeding vary depending on the location in the digestive tract.

Upper Gastrointestinal Bleeding

Peptic ulcers (stomach and duodenal ulcers) – the most common cause
Esophageal varices – enlarged veins in the esophagus, often caused by liver cirrhosis
Erosive gastritis – inflammation of the stomach lining with superficial mucosal lesions
Mallory-Weiss tears – mucosal tears at the junction of the esophagus and stomach due to forceful vomiting
Tumors of the esophagus or stomach

Lower Gastrointestinal Bleeding

Hemorrhoids – enlarged vascular cushions in the rectum
Diverticular disease – small pouches in the colon wall that can bleed
Colorectal polyps and colorectal cancer
Inflammatory bowel disease (Crohn's disease, ulcerative colitis)
Angiodysplasia – abnormal dilations of small blood vessels in the bowel wall
Infectious colitis

Symptoms

The symptoms of gastrointestinal bleeding depend on the location and severity of the bleed:

Hematemesis: vomiting of bright red blood or coffee-ground material (upper GI bleeding)
Melena: black, tarry, foul-smelling stools caused by digested blood (typically upper GI bleeding)
Hematochezia: passage of bright red blood through the rectum (typically lower GI bleeding or severe upper GI bleeding)
Pallor, dizziness, and rapid heartbeat – signs of significant blood loss
Abdominal pain or a feeling of pressure in the abdomen
Circulatory shock in cases of severe hemorrhage (low blood pressure, loss of consciousness)

Slow, chronic GI bleeding may present only with signs of anemia – such as persistent fatigue, weakness, and shortness of breath – without any visible blood in the stool.

Diagnosis

Diagnosis of GI bleeding involves a combination of clinical assessment, laboratory tests, and endoscopic procedures:

Physical examination and medical history
Blood tests: complete blood count, hemoglobin levels, and coagulation parameters
Upper endoscopy (gastroscopy): the gold standard for suspected upper GI bleeding – allows direct visualization and simultaneous treatment
Colonoscopy: examination of the colon for lower GI bleeding
Capsule endoscopy: used when small intestinal bleeding is suspected
CT angiography: imaging for difficult-to-locate or rapidly active bleeding sources
Fecal occult blood test: detects invisible blood in the stool

Treatment

Treatment depends on the cause, severity, and location of the bleeding.

Emergency Stabilization

In acute, severe bleeding, the priority is hemodynamic stabilization: intravenous fluid resuscitation, blood transfusions when necessary, and intensive monitoring of vital signs.

Endoscopic Treatment

During endoscopy, the bleeding source can often be treated directly, using techniques such as:

Epinephrine injection to constrict blood vessels at the bleeding site
Hemostatic clips to close bleeding vessels
Argon plasma coagulation (thermal ablation)
Band ligation of esophageal varices

Medical Therapy

Proton pump inhibitors (PPIs) to reduce gastric acid secretion in ulcer-related bleeding
Antibiotics to eradicate Helicobacter pylori infection as a cause of peptic ulcers
Vasopressin analogs (e.g., terlipressin) for variceal bleeding

Surgical Treatment

If endoscopic and medical treatments are insufficient, surgical intervention may be required to control the bleeding source.

Prevention

The following measures can help reduce the risk of gastrointestinal bleeding:

Avoiding excessive alcohol consumption and smoking
Using nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or aspirin with caution – consider combining them with a gastroprotective agent
Treating Helicobacter pylori infections
Undergoing regular colorectal cancer screening (colonoscopy)
Careful management of anticoagulant therapy (blood-thinning medications)

References

Laine L. et al. - ACG Clinical Guideline: Upper Gastrointestinal and Ulcer Bleeding. American Journal of Gastroenterology, 2021. Available at: https://pubmed.ncbi.nlm.nih.gov/34016826/
Strate L. L., Gralnek I. M. - ACG Clinical Guideline: Management of Patients with Acute Lower Gastrointestinal Bleeding. American Journal of Gastroenterology, 2016. Available at: https://pubmed.ncbi.nlm.nih.gov/27172433/
Wilkins T., Khan N., Nabh A., Schade R. R. - Diagnosis and Management of Upper Gastrointestinal Bleeding. American Family Physician, 2012. Available at: https://pubmed.ncbi.nlm.nih.gov/22963024/

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