Medical and Health Care

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Nausea

Main Differentials

Viral/bacterial gastroenteritis

Medication side effects (opioids, antibiotics, chemotherapy)

Migraine-associated

Early pregnancy

Gastritis/ulcer

Pancreatitis

Severe UTI or pyelonephritis

Meningitis/raised ICP

Investigations

First-line

Second-line

First-line

FBC, CRP/ESR

Second-line

H. pylori antigen/breath test

First-line

U&E, LFT, glucose

Second-line

Lipase/amylase (pancreas)

First-line

Urinalysis

Second-line

Stool MCS (infection)

β-hCG (all reproductive-age women) Cortisol AM (if adrenal insuff.)

Red Flags

Projectile vomiting

Blood in vomit

Dehydration & electrolyte imbalance

Severe abdominal pain