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Overview
What Is Gastric Outlet Obstruction?
Gastric outlet obstruction is a partial or complete blockage where the stomach empties into the duodenum, the first part of the small intestine. The gastric outlet may become narrowed by inflammation, scarring, a mass or another physical blockage. Adults are commonly affected, but the causes of this obstruction of the stomach can vary. This condition is also called gastric outflow obstruction.
Symptoms
Symptoms of Gastric Outlet Obstruction
- Nausea
- Repeated vomiting of undigested food
- Feeling full quickly after eating (early satiety)
- Upper abdominal pain or fullness
- Abdominal swelling or distention
- Reduced appetite
- Unintentional weight loss
- Signs of dehydration, such as dry mouth, dizziness or very little urine
Causes
Causes of Gastric Outlet Obstruction
Causes are often mechanical, meaning a physical narrowing or blockage prevents food and liquid from passing normally. Some problems begin at the stomach outlet itself, including pyloric obstruction from ulcers, inflammation or scarring. Others affect the nearby duodenum, where swelling, a mass or pressure from a neighboring organ can cause duodenal obstruction.
| Cause group | Examples | How it blocks flow |
|---|---|---|
| Inflammation or scarring | Peptic ulcer disease, chronic inflammation, healed injury | Narrows the pylorus or nearby duodenum; may be benign but requires evaluation and treatment |
| Mass or tumor | Stomach, pancreatic or duodenal growth | Compresses or grows into the outlet; requires evaluation for cancer |
| Pancreatic or biliary disease | Inflammation or swelling near the duodenum | Compresses the adjacent duodenum; the underlying disease needs assessment |
| Other physical blockage | Bezoar, congenital narrowing or postoperative change | Directly blocks or reduces the outlet opening and may require removal or repair |
Risk Factors
Risk Factors for Gastric Outlet Obstruction
Underlying conditions
A history of peptic ulcer disease, prior abdominal surgery, chronic inflammatory conditions, pancreatitis or diseases that can cause a mass near the stomach outlet may increase risk.
Factors to address
Tobacco use, regular use of ulcer-causing medicines such as NSAIDs and delayed evaluation of persistent upper-abdominal symptoms may contribute to risk when clinically relevant.
Having a risk factor does not establish the cause of a gastric outlet obstruction. Some people develop this gastric outlet problem without an obvious preventable risk, so persistent symptoms still need medical evaluation.
Complications
Complications of Gastric Outlet Obstruction
- Dehydration from repeated vomiting and poor fluid intake
- Electrolyte abnormalities
- Malnutrition and ongoing weight loss
- Aspiration of vomit into the lungs
- Worsening gastric distention
- Bleeding or other complications from an ulcer or mass
- Progression of the underlying disease causing the blockage
Severity depends on whether the blockage is partial or complete, how long it has been present and what caused it. Prompt treatment for gastric outlet obstruction can restore passage, improve nutrition and reduce these risks.
Diagnosis
How Gastric Outlet Obstruction Is Diagnosed
A clinician will ask about vomiting, early fullness, abdominal pain, prior ulcers or surgery, medicines, weight loss and symptoms that could suggest cancer or another serious illness. An abdominal examination may check for tenderness, swelling, dehydration or a distended stomach. This history helps guide testing for the location and cause of the outlet obstruction.
| Test | What it evaluates | What it may show |
|---|---|---|
| Blood tests | Hydration, nutrition and electrolyte status | Dehydration, electrolyte changes or anemia |
| Upper endoscopy | The stomach outlet and duodenum directly | Narrowing, ulcer, retained food, mass or tissue for biopsy |
| CT or other imaging | The stomach, duodenum and surrounding organs | Dilation, blockage location, external compression or mass |
| Contrast upper gastrointestinal study | Passage of contrast through the upper digestive tract | Delayed or blocked flow and the level of obstruction |
Treatment & Management
Treatment and Management
Immediate stabilization and supportive care
Initial care may include temporarily stopping oral intake and giving intravenous fluids to correct dehydration. Clinicians may correct electrolyte abnormalities, use a tube to decompress the stomach when needed, provide anti-nausea medicine and arrange nutritional support under medical supervision.
Treating the blockage and its cause
Treatment for gastric outlet obstruction depends on its cause and severity. Medicines may treat ulcer-related disease, while endoscopic dilation or stenting can help selected narrowed areas. A bezoar or obstructing lesion may be removed, and surgery may be needed when endoscopic treatment is unsuitable or when cancer or another structural cause requires it.
Outlook and Prognosis
Outlook and Prognosis
Many cases improve after the blockage and its cause are treated. The outlook is more complex when gastric outlet obstruction is caused by advanced cancer or severe underlying disease. Prognosis also depends on whether the obstruction is partial or complete, how long it has been present and how well nutrition and hydration can be restored.
When Should You See a Doctor
When Should You See a Doctor?
Seek urgent care
Do not wait with persistent vomiting
Seek urgent medical care for repeated vomiting, inability to keep liquids down, severe or worsening upper-abdominal pain or swelling, fainting, confusion, blood in vomit, black stools, fever or signs of dehydration.
- Call emergency services for collapse, severe weakness or trouble breathing.
Ongoing early fullness, recurrent vomiting, unexplained weight loss or worsening symptoms should prompt a non-emergency appointment, even if symptoms are not severe at that moment. These symptoms may indicate gastric obstruction at the outlet or obstruction of the duodenum and should be assessed.
Branches
1 topic
Gastric Outlet Obstruction
Gastroenterology
Symptoms
4 topics
Gastric Outlet Obstruction
Abdominal Pain
Gastric Outlet Obstruction
Bloating
Gastric Outlet Obstruction
Nausea
Gastric Outlet Obstruction
Vomiting
