I have now had three EMG tests while trying to understand the pain and weakness affecting my neck, shoulder blade, shoulder, and left arm. Before the first one, I did not really know what to expect.
Would it feel like getting shocked?
How many needles would they use?
Would the needle go into my spine?
How long would the whole thing last?
After going through the test three times, my honest answer is that an EMG is not comfortable, but mine was not horrible. There were some fairly strong electrical shocks followed by quite a few small needle pokes. My latest test lasted approximately 15 minutes from the beginning of the actual testing until it was finished.
I would not volunteer to have an EMG for fun, but I could tolerate it again if my doctor believed it would provide useful information.
The Short Answer
Yes, an EMG can hurt a little, but the discomfort usually comes in short bursts.
My testing had two distinct parts:
- Several electrical shocks during the nerve-conduction study
- Multiple small needle insertions during the needle EMG
The shocks were more startling. The needles produced a sharper, more localized discomfort. Neither sensation lasted very long by itself.
For me, anticipating what was coming was almost worse than the actual test.
An EMG Appointment Usually Includes Two Tests
Most people call the whole procedure an EMG, but the appointment often combines a nerve-conduction study with a needle electromyography examination.
They test different things and feel completely different.
The nerve-conduction study uses electrical shocks
Electrodes are attached to the skin over different nerves and muscles. The doctor or technician then delivers brief electrical impulses and records how the nerve responds.
These were the “big shocks” I felt.
The needle EMG tests individual muscles
A small needle electrode is inserted into selected muscles. The doctor records the electrical activity while the muscle is relaxed and while I move or tighten it.
These were the many small pokes I experienced.
Understanding that there would be two separate parts made the procedure much less confusing the second and third time.
What the Electrical Shocks Felt Like
The nerve-conduction portion felt like a sudden jolt that made part of my hand or arm twitch.
The shocks were quick. By the time my brain fully registered one, it was already over.
Some impulses felt relatively mild. Others were strong enough to make me jump slightly. The doctor may repeat the shock at increasing strengths because a strong enough electrical signal is needed to activate the nerve and obtain a reliable measurement.
My honest description
The shocks felt:
- Sudden
- Stronger than static electricity at times
- Startling more than truly painful
- Over almost immediately
- Different depending on where I was tested
I knew another shock was coming because the doctor was repositioning the electrodes, but I did not always know the exact second it would happen. That anticipation added to the discomfort.
The American Academy of Orthopaedic Surgeons describes the sensation as similar to the shock someone may feel after walking across carpet and touching a doorknob. Some of my shocks felt stronger than that comparison, but they were still extremely brief.
What the EMG Needles Felt Like
After the electrical portion, the doctor used a small needle to test a series of muscles.
Each insertion felt like a quick poke. Some locations were barely bothersome, while others were more sensitive. A needle placed into a sore or tight muscle naturally felt less pleasant than one placed in an area that was not already hurting.
The doctor would insert the needle, listen to and watch the electrical activity, ask me to move or tighten the muscle, and then remove it. The process was repeated in other locations.
It was not one giant needle
Before my first EMG, I pictured something much worse than what actually happened.
The needle was not placed into my spinal cord. It was inserted into selected muscles. The doctor did not leave one large needle in place for the entire test.
It was a series of relatively quick pokes.
There were quite a few needle locations
My latest test involved my hand and arm, areas closer to my neck, and a spot around my upper back. The locations were chosen to help the doctor compare muscles supplied by different nerves and cervical nerve roots.
I recently explained how an EMG can point toward a pinched nerve in the neck. The doctor needs a pattern from multiple muscles, which is why testing only one painful spot would not provide enough information.
| Part of the Test | What It Felt Like | How Long It Lasted |
|---|---|---|
| Nerve-conduction shocks | A sudden electrical jolt with a muscle twitch | A split second for each shock |
| Needle insertion | A quick, sharp poke in the tested muscle | Usually only during insertion |
| Activating the muscle | Pressure or mild aching around the needle | A few seconds at a time |
| Sensitive locations | A sharper but localized discomfort | Brief |
| After the test | Possible mild soreness or tenderness | Temporary |
If I had to choose, the stronger shocks were more startling. Some needle locations were more painful, but I could see what the doctor was doing and knew when the poke was coming.
The worst individual sensation never lasted long.
How Long Did My EMG Take?
My most recent EMG took approximately 15 minutes.
That is much shorter than some descriptions I have seen online. Test length can vary considerably depending on:
- How many limbs are examined
- How many nerves are tested
- How many muscles require needle testing
- Whether the doctor is investigating one suspected problem or several
- Whether abnormalities require additional testing
- How easily usable readings are obtained
Someone receiving a detailed examination of both arms and both legs could be there much longer than I was. My experience should not be treated as a guaranteed appointment length.
Still, for the specific hand, arm, neck, and upper-back testing I received, the actual procedure moved quickly.
Why Did the Doctor Keep Moving the Needle?
The needle electrode records electrical activity in the muscle immediately around its tip. The doctor may reposition it slightly to sample more than one area of the muscle.
This does not necessarily mean that the first placement was unsuccessful.
A muscle is made of many fibers and motor units. Sampling different spots can give the doctor a better understanding of what is happening throughout that muscle.
The doctor also asked me to relax completely and then activate certain muscles. This allowed him to compare the electrical activity at rest with what happened during contraction.
According to Mayo Clinic’s EMG overview, the neurologist looks for unusual electrical activity at rest and evaluates what happens when the patient contracts the muscle.
Why Did I Hear Strange Sounds During the Test?
The machine can turn electrical activity into sounds.
At times, I could hear crackling or other strange noises while the doctor moved the needle or asked me to activate a muscle. Those sounds are part of the electrical information being recorded.
The sounds do not automatically mean the result is abnormal. The doctor must interpret what appears on the screen and what is heard through the equipment.
Trying to diagnose myself from the noises would be like trying to diagnose a vehicle by hearing one sound without knowing what the mechanic is testing.
I waited for the doctor’s interpretation instead.
Does the Needle Go Into the Nerve?
The needle EMG is intended to record electrical activity from a muscle. It is not supposed to be inserted directly into the cervical nerve root.
This was reassuring because the phrase “nerve test” initially made me picture needles being pushed directly into the damaged nerve.
The electrical shocks stimulate nerves through the skin. The needles sample muscles controlled by those nerves. The doctor then uses the results from several locations to look for a recognizable pattern.
That pattern was particularly important in my case because my pain spreads through multiple areas. I have symptoms along the left side of my neck, near my shoulder blade, through the shoulder, and down my arm.
Did My EMG Make My Nerve Damage Worse?
I did not notice any lasting worsening of my nerve symptoms from the EMG itself.
The test intentionally stimulates nerves and places small needles into muscles, so temporary tenderness can happen. That is different from causing new lasting nerve damage.
The American Academy of Orthopaedic Surgeons says some soreness or bruising may occur after the needles are removed, but it usually resolves within a few days.
Serious complications are considered uncommon. However, it is important to tell the doctor before testing if you take blood thinners, have a bleeding disorder, use an implanted electrical device, or have another condition that could affect how the test is performed.
Was I Sore After the EMG?
I did not experience anything after the test that compared with my normal neck and arm pain.
A few tested spots can feel mildly tender, almost like the soreness after an injection. Small bruises are also possible where the needles entered the skin.
Most people should be able to return to ordinary activities after the test unless the doctor provides different instructions.
Call the medical office if something seems wrong
Normal mild tenderness is different from severe or worsening pain.
I would contact the medical office if I experienced:
- Bleeding that would not stop
- Increasing redness or warmth
- Significant swelling
- Fever
- Severe pain around a needle location
These problems are not what I experienced, but they would deserve medical attention.
How I Prepared for My EMG
There was not much special preparation involved.
I wore clothing that allowed access to the arm, shoulder, neck, and upper-back areas being examined. Depending on what part of the body is tested, the office may provide a gown.
It is generally best to arrive with clean skin and avoid applying lotion, oil, or cream to the areas being tested. Skin products can make it harder for electrodes to stick properly.
I also made sure the doctor knew about my medical history, previous C5-C6 disc replacement, ongoing weakness, pain pattern, and earlier EMG results.
Useful information to bring
If I were preparing for another EMG, I would bring:
- A current medication list
- Previous EMG reports
- Relevant MRI or surgical information
- A short description of where symptoms travel
- Notes about which activities make the weakness worse
- Any questions I want answered afterward
The test result becomes more useful when the doctor understands the problem being investigated.
What I Told the Doctor Before Testing
I explained that the pain is mainly on my left side.
It can involve:
- The left side of my neck
- The area around my shoulder blade
- Part of my upper back
- My shoulder
- My arm
- Weakness when holding or carrying weight
One of the most noticeable examples is holding my baby with my left arm while standing. After roughly five minutes, the pain can become horrible.
That real-life limitation tells the doctor more than simply saying, “My arm hurts.”
The location, type, and timing of symptoms help determine which nerves and muscles should be tested.
What My Third EMG Found
My latest EMG doctor told me the findings still appeared to point toward the C5-C6 area.
This was approximately 15 months after having my C5-C6 disc replaced. My artificial disc reportedly looks good, but I continue having pain and left-arm weakness.
I shared the full update in my article about still having pain 15 months after C5-C6 disc replacement.
The EMG did not show a picture of my nerve being pinched. It measured electrical activity and found a pattern that the doctor interpreted as likely involving the cervical nerve root. That distinction also helps explain how ibuprofen fits with abnormal EMG findings without treating pain relief as proof that the electrical findings disappeared.
That finding is now influencing what my doctors may try next.
Was the Discomfort Worth It?
For me, yes.
The test was uncomfortable, but it only lasted around 15 minutes. The individual shocks and needle pokes were brief.
More importantly, the EMG provided information that an X-ray could not give me. My X-rays can show that the artificial disc looks properly positioned, but they cannot directly measure how my nerves and muscles are functioning.
I have lived with this pain long enough that a short, uncomfortable test feels worth it if it helps answer even one important question.
That does not mean the result solved everything. I still need to understand whether the EMG shows old nerve damage, ongoing irritation, or a mixture of both. The possible relationship between persistent EMG changes and nerve recovery is explained in what persistent EMG changes may mean.
Questions Worth Asking Before an EMG
Which areas of my body will you test?
The number of limbs and muscles being examined can affect both the test length and the amount of discomfort.
Will I have both electrical shocks and needles?
Most electrodiagnostic examinations use both nerve-conduction testing and needle EMG, but the exact testing plan can vary.
Should I stop any medications?
I would never stop a blood thinner or another medication on my own. The ordering doctor or EMG office should provide individualized instructions.
Can I take a break if I need one?
If the discomfort becomes overwhelming, I can tell the doctor. A short pause may be possible without ending the entire test.
When will I receive the results?
Sometimes the doctor can explain the general findings immediately. In other cases, a full report is sent to the physician who ordered the test.
Will you compare this test with my older EMGs?
Because I have undergone three tests, the changes between them may matter just as much as the newest result by itself.
What I Would Tell Someone Nervous About an EMG
Expect some discomfort, but do not let frightening descriptions convince you that the test will necessarily be unbearable.
My experience involved several strong shocks and many small needle pokes. It was not enjoyable, but it was manageable and moved quickly.
Try to keep the tested muscles relaxed when the doctor asks. Tensing before each needle poke may make the experience more uncomfortable.
Tell the doctor when something hurts, but understand that a brief jolt, twitch, or poke is part of how the test gathers information.
Most importantly, ask what the results actually mean for your specific symptoms. Completing an uncomfortable test is only worthwhile if someone clearly explains what was learned from it.
Written by Daxon Weaver, who shares his real experiences with cervical disc replacement, lumbar fusion, chronic nerve pain, EMG testing, and spine surgery recovery on Spine Recover. This article describes one patient’s experience and is not a substitute for individualized medical care.
