Electromyography (EMG) assesses the health of muscles and the nerves (motor neurons) that control them. When you move a muscle, motor neurons transmit electrical signals that cause the muscle to contract.
An EMG translates these signals into graphs, sounds or numerical values that can be interpreted by a specialist to help your doctor diagnose your condition. Your EMG results could help diagnose or rule out things like muscular dystrophy, carpal tunnel syndrome, herniated disks or sclerosis.
Your doctor may order an EMG if you have:
Muscle pain or cramping