Head Side Tingling: Causes from Nerves to Emergencies

Common Causes of Unilateral Head/Face Paresthesia

1. Trigeminal neuralgia – Lancinating V2/V3 pain; trigger zones.
2. Occipital neuralgia – Posterior scalp shooting pain; C2/C3.
3. Cervicogenic headache – Neck origin → referred to occiput/temple.
4. Temporal arteritis (GCA) – >50 yrs; scalp tenderness, jaw claudication, vision threat. ESR/CRP ↑. Emergency.
5. Sinusitis – Pressure, congestion; maxillary/frontal/sphenoid.
6. Migraine aura – Paresthesia marching over 20–60 min, often hand→face→lip.
7. Post‑herpetic neuralgia – After V1/V2 shingles; burning, allodynia.
8. TIA / stroke – Sudden unilateral face/arm/leg numbness ± speech deficit. FAST: call 911.
9. Brain tumor (rare) – Progressive, with other focal signs.

Red Flags (Immediate ER)

• Sudden onset + weakness, speech, vision change.
• Thunderclap headache.
• New headache >50 with scalp tenderness.
• Altered consciousness.

Workup

• Neuro exam; MRI brain ± MRA; ESR/CRP if GCA suspected; VZV PCR if shingles history.

Don’t ignore new unilateral head paresthesia—timely diagnosis prevents disability.