Leg numbness/tingling causes: ① disc herniation (most common): pain/numbness following nerve dermatome, ② sciatica: piriformis syndrome or disc-induced, ③ stenosis: bilateral with walking, ④ peripheral neuropathy (diabetes, etc.), ⑤ vascular issues. Korean medicine treatment for nerve symptoms: acupuncture, electroacupuncture, pharmacopuncture, herbs. Most patients see significant improvement within 4–8 weeks. MRI confirms diagnosis.