Electromyography (EMG)
Electromyography (EMG) is a test that measures muscle and nerve activity to help find the cause of weakness, numbness, pain, tingling or muscle symptoms.
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What Is Electromyography (EMG)?
Electromyography (EMG) is a diagnostic test that checks how well your muscles and the nerves that control them are working. It records the electrical activity in muscles at rest and during movement. EMG is often used with nerve conduction studies (NCS), which measure how quickly electrical signals move through a nerve.
This test may help your physician evaluate symptoms such as muscle weakness, muscle cramps, numbness, tingling, burning pain or loss of muscle control. EMG does not treat a condition, but it can help identify whether symptoms may be related to a muscle disorder, a nerve problem, or the connection between the nerve and muscle.
Why Choose Baptist Health?
At Baptist Health Brain & Spine Care, EMG testing is part of a broader evaluation focused on finding the source of your symptoms and guiding next steps in care. Your physician may use EMG results along with your exam, medical history, imaging and other tests to better understand what is affecting your nerves or muscles.
Because nerve and muscle symptoms can have many causes, a coordinated approach matters. We bring together specialists who evaluate conditions affecting the peripheral nerves, muscles and neuromuscular system. Treatment recommendations are based on your symptoms, diagnosis, daily function and overall health.
Frequently Asked Questions
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EMG helps evaluate how well muscles and the nerves controlling them are working. It may help your physician look for causes of weakness, tingling, numbness, muscle twitching, cramping or certain types of pain.
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No. They are different tests, but they are often done together. Nerve conduction studies measure how electrical signals move through a nerve. EMG measures electrical activity inside muscles.
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Some people feel brief discomfort during parts of the test. The nerve conduction portion can feel like small quick pulses on the skin. The needle EMG portion may cause short-lasting discomfort and mild soreness afterward.
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The length of the test varies based on the symptoms being evaluated and how many nerves or muscles need to be tested. Many studies are completed in less than an hour but timing can vary.
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Usually, preparation is simple. You may be asked not to apply lotions or creams on the day of testing and to wear clothing that makes the test area easy to reach. Your physician may also review your medications ahead of time.
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Many people can drive themselves home because EMG is usually done without sedation. Your physician will let you know if your situation is different or if other testing is planned the same day.
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EMG may help evaluate peripheral neuropathy, nerve compression, radiculopathy (a pinched nerve affecting a nerve root), muscle disorders and other neuromuscular conditions. Results are interpreted together with your exam and health history.
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Your physician reviews the findings and explains what they may mean for your symptoms. Depending on the results, the next step may include follow-up care, treatment recommendations, imaging, lab work or additional testing.
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