@spineinsiders: Leg Numbness? The Problem Might Be Your Spine! Tingling in your calf, shin, or foot often starts in your lower back—not your leg! Disc bulges at L4-L5 or L5-S1 irritate nerve roots and send misfiring signals down the leg. #SciaticaPain #NervePain #SpineCare #LegNumbness #Anatomy101