Medically reviewed by Dr. Sarim Mir, board-certified neurologist at Mir Neurology.
EEG and EMG sound almost identical, so it’s easy to mix them up — but they test completely different parts of your nervous system. In short: an EEG looks at your brain, while an EMG looks at your nerves and muscles. Here’s how the two tests differ, which symptoms point to each, and how to know which one you need. Both are available on-site at Mir Neurology in Hagerstown and Cumberland.
Quick answer: brain vs. nerves and muscles
An EEG (electroencephalogram) records the electrical activity of your brain. An EMG (electromyography), usually paired with a nerve conduction study, measures how well your nerves and muscles are working. If your symptoms involve seizures, spells, or changes in awareness, you’re likely headed for an EEG. If they involve numbness, tingling, weakness, or pain in your limbs, an EMG is the more likely test.
What an EEG tests
During an EEG, small sensors are placed on your scalp to capture your brain’s electrical patterns as waves. It’s painless and non-invasive — the sensors only listen, sending nothing into your body. Neurologists use EEGs to evaluate seizures and epilepsy, unexplained spells of confusion, and certain sleep-related concerns. You can read more about what the test involves in our guide to what to expect during an EEG test.
What an EMG tests
An EMG evaluates the health of your nerves and muscles. It typically has two parts: a nerve conduction study, which measures how quickly signals travel along your nerves, and the EMG itself, which checks the electrical activity of your muscles using a very fine sensor. Neurologists use it to investigate numbness, tingling, weakness, muscle cramping, and nerve pain — helping diagnose conditions like carpal tunnel syndrome and peripheral neuropathy.
Symptoms that point to each test
As a general guide, your neurologist may order an EEG for seizures, blackouts, staring spells, or unexplained episodes of confusion. An EMG is more likely for numbness or tingling in the hands or feet, muscle weakness, limb pain, or symptoms that suggest a pinched or damaged nerve. Your specific symptoms and exam guide the choice — and sometimes the answer is both.
Can you need both?
Yes. Some symptoms overlap, or a person may have more than one issue being evaluated at the same time. Because the tests look at different systems — brain versus nerves and muscles — ordering both can give your neurologist a fuller picture when the cause isn’t clear.
On-site EEG and EMG testing at Mir Neurology
Mir Neurology offers both tests on-site, with results reviewed by our board-certified team. Learn more about EEG testing or EMG and nerve conduction studies, and explore our epilepsy and seizure care if seizures are part of the picture. Not sure which test you need? Schedule your test or call (301) 797-7600 and our team will help.
Frequently asked questions
Is an EEG or EMG more uncomfortable?
An EEG is painless. An EMG can cause brief, mild discomfort during the muscle portion, but most people tolerate it well and it’s over quickly.
Can one appointment cover both?
Often, yes. If your neurologist orders both, they can frequently be coordinated — ask our team when you schedule.
Which test is for seizures?
An EEG. It records brain activity and is the primary test used to evaluate seizures and epilepsy.
Which test is for numbness?
An EMG with a nerve conduction study. It evaluates the nerves and muscles behind numbness, tingling, and weakness.
Need to talk to a neurologist about this?
Mir Neurology offers same-week appointments in Hagerstown & Cumberland, MD. No referral needed for most plans.
