Pain on entire left side, sore, hands and fingers are numb. Hard to grip things. Leg & arm pain also headache on the left side of head. What's wrong?

Not certain without. more information. But if it persists, sounds like you need to see a neurologist to figure out if this complex unilateral nerve distribution pain/numbness can be blamed on one syndrome or condition. Have a wonderful day and thanks for trusting in HealthTap.