Differential Diagnoses: 45-Year-Old Male with Giddiness + Headache x 2 Days, No Known Comorbidities

STEP 1 - Classify the "Giddiness"

MUST-NOT-MISS (Red Flag / Life-Threatening) Differentials

1. Cerebellar / Brainstem Stroke (Posterior Circulation)

• Classic presentation: Sudden onset vertigo + headache + nausea, often with other brainstem signs (diplopia, dysarthria, dysphagia, facial weakness, ataxia)
• Age 45 puts him in range for early vascular disease
• Red flags: Severe imbalance, inability to walk, nystagmus that doesn't fatigue, headache that is new or worst-ever
• A 45-year-old male could have occult hypertension, dyslipidemia, or smoking history
• Tintinalli's Emergency Medicine notes cerebellar/brainstem stroke "often presents with other neurologic signs or symptoms, but can present with symptoms similar to vestibular neuritis" - use the HINTS exam (Head Impulse, Nystagmus, Test of Skew) if nystagmus is present

2. Subarachnoid Hemorrhage (SAH)

• Classically "thunderclap" headache (worst headache of life), but some present subacutely over 2 days
• May accompany vertigo/giddiness
• Sentinel leaks can present as moderate headache + dizziness for days before a catastrophic bleed
• Examination: neck stiffness, photophobia, reduced GCS

3. Hypertensive Emergency

• Even in a patient with "no known comorbidities," undiagnosed hypertension is common in a 45-year-old male
• Hypertensive emergency: BP >180/120 with end-organ damage
• Presents with headache (typically occipital, worse in morning), dizziness, visual changes, nausea
• Must check BP immediately in all such patients

4. Cerebellar Hemorrhage

• Severe headache + giddiness + vomiting + gait ataxia
• Can progress rapidly to coma and death from tonsillar herniation
• Neurosurgical emergency

5. Posterior Circulation TIA

• Episodes of vertigo + headache lasting minutes-to-hours
• Often no residual deficits - easily missed
• Risk increases with cardiovascular risk factors (even undiagnosed ones)

COMMON / Likely Benign Differentials

6. Benign Paroxysmal Positional Vertigo (BPPV)

• Most common cause of vertigo overall
• Brief episodes (<1 minute), triggered by specific head movements (e.g., rolling over in bed, looking up)
• No headache is typical - so if headache is prominent, BPPV alone is less likely
• Diagnosed with Dix-Hallpike maneuver (upward vertical + rotatory nystagmus)

7. Vestibular Neuritis

• Continuous vertigo for hours to days, nausea/vomiting, made worse by movement
• Preceded by viral URTI in many cases
• No hearing loss (differentiates from labyrinthitis), no headache usually
• Spontaneous improvement over days-weeks

8. Vestibular Migraine

• Most common central cause of vertigo (often underdiagnosed)
• Recurrent attacks in patients with migraine history - about half have migrainous features (photophobia, phonophobia, nausea)
• Headache + vertigo together is the hallmark
• Can last minutes to hours; treat as per migraine

9. Labyrinthitis

• Ear pain, tinnitus, hearing loss onset 1+ days before vertigo
• Associated with otitis media

10. Meniere's Disease

• Triad: recurrent episodic vertigo + sensorineural hearing loss + tinnitus + aural fullness
• Episodes last 20 minutes to several hours
• Less likely to be the first presentation at age 45 without prior episodes

SYSTEMIC / Metabolic Causes

11. Tension-Type Headache + Separate Dizziness

• Tight band-like bilateral headache, mild-moderate, hours to days
• Dizziness may be unrelated (anxiety, dehydration)

12. Orthostatic Hypotension / Presyncope

• Faintness on standing (especially in dehydration, poor oral intake, early morning)
• Postural BP measurement is diagnostic

13. Anemia

• Lightheadedness + headache, especially if rapid onset or significant blood loss
• Check CBC

14. Hypoglycemia

• Sudden lightheadedness + headache, especially if missed meals
• Check blood glucose immediately

15. Carbon Monoxide Poisoning

• Headache + dizziness is a classic combination in CO poisoning - ask about household symptoms, gas appliances, others affected in same household
• Often missed; check CO-oximetry

16. Cervicogenic Dizziness

• Dizziness associated with neck pain, limited neck range of motion, headache
• Common in posterior cervical muscle spasm; diagnosis of exclusion

17. Anxiety / Panic Disorder

• Ill-defined lightheadedness + headache in the context of stress or panic attacks

Approach Framework (Immediate Workup)

1. VITAL SIGNS FIRST - BP (both arms), HR, SpO2, RBS, temperature
2. NEUROLOGICAL EXAM - Cranial nerves, cerebellar signs, HINTS exam (if nystagmus present),
   gait, Romberg
3. HISTORY REFINEMENT:
   - Character of headache (thunderclap? worst-ever? positional?)
   - Character of dizziness (spinning? fainting? imbalance?)
   - Duration of each episode
   - Triggers (head movement vs. spontaneous)
   - Associated symptoms: tinnitus, hearing loss, neck stiffness, visual changes,
     diplopia, dysarthria, nausea/vomiting
   - Fever, recent URTI (vestibular neuritis)
   - Others in household affected? (CO poisoning)

Investigations to order:

Summary Priority List

Clinical note: In a 45-year-old male with NO known comorbidities presenting with 2 days of headache and giddiness, the combination of symptoms lasting 2 days (subacute) makes vestibular migraine, vestibular neuritis, and posterior circulation stroke/TIA the top central differentials. A missed posterior fossa stroke presenting as "dizziness + headache" is one of the most common diagnostic errors in emergency medicine. Always perform HINTS exam and have a low threshold for MRI-DWI.