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Acute Nausea and Vomiting

Overview

Nausea is the uncomfortable sensation that precedes vomiting, while vomiting (emesis) is the forceful expulsion of stomach contents through the mouth. When these symptoms develop suddenly and last less than 24 hours, they are classified as **acute** nausea and vomiting.

Acute nausea and vomiting (ANV) are among the most common reasons for emergency‑department (ED) visits worldwide. In the United States, roughly 5–7 % of all ED encounters involve vomiting, translating to >10 million visits each year. Women are slightly more affected than men, and children under 5 years old have the highest incidence because of viral gastroenteritis and motion sickness.

Although most episodes resolve spontaneously, ANV can be a sign of serious illness (e.g., appendicitis, diabetic ketoacidosis, intracranial bleed). Prompt assessment helps identify dangerous causes and prevents dehydration, electrolyte disturbances, and other complications.

Symptoms

Acute nausea and vomiting often present as a cluster of related signs. The following list includes the most frequent manifestations and brief descriptions:

• Rising sensation of nausea – queasy feeling, often described as “the stomach turning.”
• Vomiting (emesis) – expulsion of partially digested food, liquid, or bile.
• Abdominal discomfort or cramping – may be diffuse or localized.
• Loss of appetite – reduced desire to eat or drink.
• Salivation – excessive drooling preceding vomiting.
• Headache – can be part of migraine‑related nausea or dehydration.
• Dizziness or light‑headedness – often from orthostatic changes or hypovolemia.
• Fever & chills – suggest an infectious cause (e.g., gastroenteritis).
• Diarrhea – common in viral or bacterial gastroenteritis.
• Chest pain or heartburn – may indicate gastro‑esophageal reflux or cardiac ischemia.
• Altered mental status – confusion, lethargy, or agitation can signal severe metabolic derangements.

Causes and Risk Factors

Acute nausea and vomiting are symptoms, not diseases. They arise when the brain’s vomiting center (the medulla) receives a “danger signal” from any of the following pathways:

Gastrointestinal causes

• Infections: Viral (norovirus, rotavirus), bacterial (Salmonella, E. coli) or parasitic gastroenteritis.
• Food poisoning: Toxin‑producing bacteria (Staphylococcus aureus, Bacillus cereus).
• Peptic ulcer disease or gastritis – especially when bleeding occurs.
• Appendicitis, diverticulitis, bowel obstruction – mechanical irritation of the gut.

Central nervous system causes

• Migraine – nausea is a hallmark of migraine attacks.
• Head trauma or intracranial hemorrhage – increased intracranial pressure.
• Infections: Meningitis, encephalitis.
• Medication‑induced vertigo (e.g., aminoglycosides).

Metabolic and endocrine causes

• Diabetic ketoacidosis (DKA) – hyperglycemia with acidosis.
• Hypercalcemia, uremia, adrenal insufficiency.

Medication and toxin‑related

• Chemotherapy, radiotherapy – especially agents like cisplatin.
• Opioids, anesthetics, antibiotics (e.g., macrolides).
• Alcohol intoxication or withdrawal.
• Ingested toxins – heavy metals, pesticides.

Other common triggers

• Motion sickness – car, boat, airplane.
• Pregnancy – “morning sickness,” affects up to 70 % of early pregnancies.
• Psychological stress, anxiety – functional nausea.
• Post‑operative state – anesthesia emergence.

Risk factors

• Age < 5 years (viral gastroenteritis) or > 65 years (poly‑pharmacy, reduced renal reserve).
• Female sex (higher prevalence of migraine and pregnancy‑related nausea).
• Underlying chronic conditions (diabetes, inflammatory bowel disease).
• Recent use of emetogenic medications (chemotherapy, opioids).
• History of motion sickness or previous episodes of ANV.

Diagnosis

Because nausea and vomiting have many possible origins, the evaluation focuses on pattern recognition, history, and targeted physical examination.

History taking

• Onset, duration, frequency, and amount of vomitus (food, bile, blood).
• Associated symptoms (fever, abdominal pain, headache, neurological signs).
• Recent exposures: travel, sick contacts, new foods, medications, alcohol.
• Pregnancy status in women of child‑bearing age.
• Past medical history (diabetes, migraine, GI disease).

Physical examination

• Vital signs – fever, tachycardia, hypotension (sign of dehydration).
• General appearance – dehydration, pallor, diaphoresis.
• Abdominal exam – tenderness, guarding, bowel sounds.
• Neurologic exam – level of consciousness, focal deficits.
• Oral cavity – presence of blood, dental plaques.

Laboratory and imaging studies

Test	When it’s indicated
Complete blood count (CBC)	Suspected infection, anemia, or leukocytosis.
Electrolytes, BUN, creatinine	Assess dehydration, renal function.
Blood glucose	Rule out DKA or hypoglycemia.
Liver function tests	Suspected hepatitis or biliary obstruction.
Serum ketones, arterial blood gas	DKA evaluation.
Pregnancy test (β‑hCG)	All women of reproductive age.
Stool culture/viral PCR	Profound diarrhea with vomiting.
Head CT or MRI	Severe headache, neurologic deficits, trauma.
Abdominal ultrasound/CT	Suspected obstruction, appendicitis, gallstones.

Clinical scoring tools

The Mayo Clinic Dehydration Assessment Tool and the Elderly Vomiting Severity Index help determine the need for IV fluids or hospitalization.

Treatment Options

Treatment goals are to stop the vomiting, correct the underlying cause, and prevent dehydration/electrolyte loss.

Pharmacologic therapy

• Antiemetics
  • Serotonin (5‑HT₃) antagonists – ondansetron 4–8 mg IV/PO; excellent for chemotherapy, gastroenteritis.
  • Dopamine antagonists – metoclopramide 10 mg IV/PO; useful for migraine‑associated nausea.
  • Antihistamines – diphenhydramine 25–50 mg PO; helpful in motion sickness.
  • NK₁ receptor antagonists – aprepitant, primarily for chemotherapy‑induced nausea.
  • Cannabinoids – dronabinol for refractory chemotherapy nausea (per NCCN guidelines).
• Acid‑suppressive therapy – H₂ blockers or PPIs if GERD or ulcer disease is implicated.
• Analgesics – acetaminophen or NSAIDs for migraine‑related pain (avoid NSAIDs in dehydration).
• Glucose & electrolytes – oral rehydration solutions (ORS) or IV fluids (e.g., 0.9 % saline) for moderate‑to‑severe dehydration.

Procedural interventions

• IV fluid resuscitation – 500–1000 mL isotonic saline over 30 min for adults with signs of hypovolemia.
• Nasogastric (NG) tube placement – for persistent vomiting that jeopardizes airway protection or causes gastric distention.
• Endoscopic evaluation – when upper GI bleed or obstruction is suspected.

Lifestyle & non‑pharmacologic measures

• Small, bland meals (toast, crackers, plain rice) every 2–3 hours.
• Clear fluids first – sparkling water, electrolyte drinks, ginger tea.
• Positioning – sit upright or semi‑recumbent; avoid lying flat.
• Acupressure wrist bands (P6 point) – modest evidence for motion sickness.
• Stress‑reduction techniques – deep breathing, guided imagery for functional nausea.

Living with Nausea and Vomiting (Acute)

Even short‑term episodes can disrupt daily life. The following practical tips help patients manage symptoms while they recover:

1. Hydration plan: Aim for 250‑500 mL of clear fluid every 30 minutes. Use ORS or diluted sports drinks if plain water triggers more nausea.
2. Dietary adjustments: Follow the “BRAT” diet (Bananas, Rice, Applesauce, Toast) after the first 6 hours of no vomiting. Gradually re‑introduce protein and fats.
3. Medication timing: Take antiemetics at the first sign of nausea, not after vomiting begins. Keep a small supply at work or school.
4. Oral hygiene: Rinse mouth with water or a mild saline solution after each episode to reduce metallic taste and prevent dental erosion.
5. Activity pacing: Rest in a quiet, well‑ventilated room. Light activity (short walks) is okay once vomiting stops, but avoid vigorous exercise for 24 hours.
6. Monitor for dehydration: Dark urine, dizziness, dry mouth, or rapid heartbeat are red flags.
7. Track triggers: Keep a brief diary noting foods, medications, travel, and stress levels to help clinicians identify patterns.

Prevention

Because ANV often results from known triggers, preventive strategies are largely situational:

• Vaccination against rotavirus (infants) and influenza (all ages) reduces viral gastroenteritis.<sup>1</sup>
• Practice safe food handling – refrigerate leftovers promptly, cook meats to safe internal temperatures.<sup>2</sup>
• Use prophylactic antiemetics before chemotherapy, high‑risk surgeries, or anticipated travel‑related motion sickness.
• Stay hydrated, especially during hot weather or when ill.
• Limit alcohol intake and avoid binge drinking.
• For pregnant women, take prenatal vitamins with Vitamin B₆ and ginger under obstetric guidance.

Complications

If not addressed promptly, acute nausea and vomiting can lead to serious sequelae:

• Dehydration – up to 6 % fluid loss can cause orthostatic hypotension and renal hypoperfusion.
• Electrolyte imbalances – hypokalemia, hyponatremia, metabolic alkalosis (from loss of gastric acid).
• Aspirational pneumonia – especially in altered‑conscious patients or those with neurologic disease.
• Dental erosion – chronic exposure to stomach acid damages enamel.
• Weight loss and malnutrition – prolonged episodes (> 48 h) in children or the elderly.
• Underlying disease progression – delayed diagnosis of conditions such as bowel obstruction, pancreatitis, or malignancy.

When to Seek Emergency Care

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Sources: Mayo Clinic, CDC, National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), World Health Organization, Cleveland Clinic, peer‑reviewed journals (e.g., JAMA, Gastroenterology), and clinical guidelines from the American College of Emergency Physicians.

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