Foot Tingling and Prickling: Common Causes and When to See a Doctor

Prickling (paresthesia) under the foot suggests nerve or vascular involvement. Common causes:

1. Peripheral neuropathy: Diabetes (most common), alcohol, B12 deficiency, toxins, chemotherapy. Stocking-glove distribution.
2. Lumbar radiculopathy (sciatica): L5/S1 nerve root compression → radiating pain/numbness to foot.
3. Tarsal tunnel syndrome: Posterior tibial nerve compression at medial ankle → plantar paresthesia.
4. Morton's neuroma: Interdigital nerve thickening → forefoot burning/numbness (usually 3rd webspace).
5. Plantar fasciitis: Heel pain; may have neuropathic component from inflammation.
6. Vascular: Peripheral artery disease (claudication), Raynaud's.
7. Systemic: Hypothyroidism, vasculitis, multiple sclerosis.
8. Local compression: Tight shoes, crossing legs, prolonged pressure.

When to See a Doctor

• Persistent >1 week
• Progressing or spreading
• Associated weakness, foot drop
• Diabetes or vascular disease
• Bowel/bladder changes (cauda equina)

Workup: neurologic exam, labs (glucose, B12, TSH, ESR), EMG/NCS, imaging (spine MRI, ankle US).