My Left Arm From My Elbow To My Fingertips Feel

my left arm from my elbow to my fingertips feel like they are on fire. i have no trouble using them. it feels like it starts in the elbow on the inside. it feels like when it goes to sleep and you scratch it, that weird feeling. it also involves my whole left side except for my leg. everything on the left side is warm and everything on the right side is normal.