What causes dizziness and vomiting?

Dizziness and vomiting can arise from a wide range of underlying causes, spanning neurological, vestibular, cardiovascular, metabolic, infectious, and psychiatric domains. Common etiologies include vestibular disorders such as benign paroxysmal positional vertigo (BPPV), vestibular neuritis, or Ménière disease—conditions that disrupt the inner ear’s balance apparatus and trigger intense vertigo, nausea, and emesis. Central nervous system pathology—including posterior circulation stroke, cerebellar or brainstem lesions, multiple sclerosis, or intracranial hypertension—must be urgently considered, especially when dizziness is accompanied by ataxia, dysarthria, nystagmus, or focal neurologic deficits. Cardiovascular causes like orthostatic hypotension, arrhythmias (e.g., bradycardia or atrial fibrillation with rapid ventricular response), or acute myocardial infarction—particularly in older adults or those with cardiac risk factors—can impair cerebral perfusion and provoke presyncope or syncope-associated nausea.

Metabolic disturbances—including severe hypoglycemia, hyponatremia, uremia, or hepatic encephalopathy—may also manifest with dizziness and vomiting due to altered neuronal excitability or cerebral edema. Acute systemic infections (e.g., viral gastroenteritis, meningitis, or labyrinthitis), medication side effects (notably antihypertensives, sedatives, antibiotics like gentamicin, or chemotherapeutics), migraine-associated vertigo (vestibular migraine), and anxiety or panic disorders are additional frequent contributors. In older adults, polypharmacy and age-related declines in vestibular, visual, and proprioceptive integration heighten vulnerability to dizziness and falls. A thorough history—including onset, duration, triggers, associated symptoms (e.g., headache, hearing loss, tinnitus, chest pain, fever), medication review, and social context—is essential. Physical examination should assess vital signs, orthostatic blood pressure, gait and coordination, cranial nerves, nystagmus, and the Dix–Hallpike maneuver. Targeted investigations—such as basic labs (electrolytes, glucose, renal function), ECG, audiometry, vestibular testing, or neuroimaging (MRI preferred for suspected central causes)—are guided by clinical suspicion. Prompt evaluation is critical, particularly when red flags are present: sudden onset, headache with neck stiffness, focal neurologic deficits, altered mental status, or persistent vomiting without clear peripheral cause.