Vomiting 5 Minutes After Eating: Causes from Food Poisoning to GI Disorders

Rapid Postprandial Vomiting: Differential Diagnosis

Vomiting within minutes of eating suggests gastric irritation, rapid emptying, or central triggers rather than distal obstruction.

Acute Infectious/Toxic Causes

• Food poisoning: Preformed toxins (S. aureus, B. cereus) → 1–6 hrs; infectious (Salmonella, norovirus) → 12–48 hrs
• Gastroenteritis: Viral (norovirus, rotavirus) or bacterial; vomiting ± diarrhea, fever

Functional & Motility Disorders

• Gastroparesis: Delayed emptying → nausea/vomiting undigested food hours later (not minutes)
• Rumination syndrome: Effortless regurgitation <30 min post-meal; re-chew/swallow; behavioral
• Cyclic vomiting syndrome: Stereotyped episodes; migraine-associated

Structural / Mechanical

• Pyloric stenosis (infants): Projectile vomiting at 3–6 wks
• Gastric outlet obstruction: Ulcer, cancer – vomiting hours after meals
• Hiatal hernia / GERD: Reflux-triggered vomiting, usually later

Central / Systemic Triggers

• Migraine: Nausea/vomiting as aura or accompaniment
• Increased ICP: Projectile, morning; headache, papilledema
• Vestibular: Vertigo-induced (motion, BPPV)
• Medication side effects: Chemo, opioids, antibiotics, digoxin, iron
• Pregnancy (hyperemesis): Hormonal; often morning but can be postprandial
• Psychogenic: Anxiety, eating disorders, conversion

Red Flags – Urgent Evaluation

• Hematemesis / coffee-ground emesis
• Signs of dehydration
• Weight loss, malnutrition
• Neurologic signs
• Persistent >48 hrs

Diagnostic Approach

1. History: Timing, content, triggers, meds, red flags
2. Labs: BMP, CBC, LFTs, lipase, β-hCG, TSH
3. Imaging: Abdominal XR → CT → Gastric emptying study
4. Endoscopy if alarm features or refractory

Rapid vomiting after eating is often self-limited (viral/toxin). Recurrent episodes warrant GI workup.