Vomiting After Eating - Clinical Overview

How Timing Points to the Cause

• Rosen's Emergency Medicine, p. Table 25.3 and surrounding text
• The Washington Manual of Medical Therapeutics

Common Causes

Gastrointestinal Causes (Most Common)

• Gastroparesis - Delayed gastric emptying; cardinal symptoms are early satiety and vomiting of undigested food >6 hours after eating. Common in diabetics (autonomic neuropathy) and post-surgical patients.
• Gastric outlet obstruction - Can be from peptic ulcer disease, malignancy, or pyloric stenosis; vomiting >1 hour post-meal, often projectile.
• Functional dyspepsia - May be clinically indistinguishable from gastroparesis but with normal gastric emptying.
• Peptic ulcer disease (PUD) - Postprandial upper/mid-abdominal pain starting within 30 minutes; gastric ulcers often worsen with eating, duodenal ulcers may improve.
• Gastritis - Often from NSAIDs, H. pylori, or alcohol.
• Cholecystitis / biliary colic - Fat-rich meals trigger right upper quadrant pain and vomiting.
• Pancreatitis - Vomiting with severe epigastric pain radiating to the back.
• Gastroenteritis / food poisoning - Vomiting + diarrhea; usually acute onset.
• Chronic mesenteric ischemia - "Intestinal angina"; postprandial pain 30-60 min after eating, nausea, weight loss (patients fear food = sitophobia).

Non-GI Causes

• Pregnancy (especially hyperemesis gravidarum) - Morning nausea/vomiting, first trimester
• Medications - Opioids, antibiotics, NSAIDs, chemotherapy, digoxin
• Metabolic - Diabetic ketoacidosis (DKA), adrenal insufficiency, uremia, thyroid disorders
• Neurological - Raised intracranial pressure (especially morning vomiting, may lack nausea), migraines
• Anxiety / eating disorders - Bulimia (immediate post-meal vomiting)

Red Flag Symptoms - Seek Urgent Care

• Blood in vomit (hematemesis) - possible GI bleed, Mallory-Weiss tear
• Severe abdominal pain - bowel obstruction, ischemia, peritonitis
• Vomiting without preceding nausea - suspect CNS pathology
• Unexplained weight loss
• Jaundice
• Signs of dehydration (dizziness, dry mouth, dark urine)

Diagnostic Approach

1. History: Timing, contents of vomit (digested vs. undigested), associated symptoms (pain, diarrhea, fever), medications, pregnancy status, prior GI surgery
2. Labs: CBC, metabolic panel (electrolytes, BUN/creatinine), LFTs, lipase, pregnancy test
3. Rule out bowel obstruction and pregnancy first (imaging, urine hCG)
4. Endoscopy if red flag symptoms, hematemesis, or weight loss
5. Gastric emptying study (nuclear medicine scintigraphy) - gold standard to diagnose gastroparesis vs. functional dyspepsia
6. Abdominal imaging (CT, ultrasound) if obstruction, biliary, or pancreatic cause suspected

Treatment Principles

• Correct fluid and electrolyte imbalances (oral rehydration or IV fluids)
• Restrict oral intake to clear liquids initially; advance as tolerated
• NG tube decompression if bowel obstruction or protracted vomiting

• Gastroparesis: Dietary changes (small, low-fat meals), metoclopramide, erythromycin (short-term prokinetic)
• PUD/Gastritis: Proton pump inhibitors (PPIs), H. pylori eradication if positive
• Cholecystitis: Cholecystectomy
• Obstruction: Surgical or endoscopic intervention
• DKA: IV insulin + fluids + electrolytes

• Ginger (0.5-1 g/day) - Evidence for reducing nausea in postoperative, pregnancy-related, and chemotherapy-induced vomiting; comparable to metoclopramide in some studies. Use caution with anticoagulants.
• Pyridoxine (Vitamin B6) - Useful for pregnancy-related nausea

Disclaimer: This is educational information only. If you or someone is experiencing persistent or severe vomiting, vomiting blood, severe abdominal pain, or signs of dehydration, please seek medical care promptly. A doctor can identify the underlying cause and recommend appropriate treatment.