Diagnosing Nerve and Muscle Disorders with EMG
Electromyography (EMG) assesses the health of your muscles as well as the nerves that control your muscles. EMGs are ordered most often when patients are experiencing muscle weakness. The test helps doctors determine if weakness is due to a neurological disorder.
During an EMG, a very thin needle is inserted into your muscle. An electrode on the needle measures electrical activity given off by the muscle. Once the needle is inserted, you may be asked to contract or flex the area so the technician can gauge the response.
You may feel some discomfort during an EMG, but most people are able to proceed without trouble. The area where electrodes are inserted may be bruised or feel tender for a few days afterward.
EMG can help diagnose
- An EMG can detect problems with your muscles during rest or activity. Common disorders or conditions that cause abnormal results include the following:
- Pinched nerves and inflamed muscles
- Carpal Tunnel Syndrome
- Muscular Dystrophy
- Amyotrophic lateral sclerosis (ALS)
- Primary muscle disorders
- Neuromuscular disorders
- Nerve disorders