If you’ve spent any time looking at unmedicated birth or labor comfort techniques, you’ve probably seen someone laboring with a small device attached to their back, sometimes with a controller hanging around their neck or wrist.
That device is a TENS unit, and it can be a valuable tool for pain relief during pregnancy, labor, and postpartum.
TENS stands for Transcutaneous Electrical Nerve Stimulation. We like to describe it as a form of “electric massage” for your body. It uses small electrical impulses delivered through adhesive pads placed on the skin to create a tingling sensation that can help reduce how strongly you perceive pain.
While we don’t fully understand exactly why TENS provides pain relief, there are two primary theories for how it may work: the gate control theory of pain and the stimulation of your body’s own natural pain-relieving mechanisms.
And while a TENS unit isn’t going to make your contractions disappear like an epidural can, research supports it as a meaningful, non-invasive option for labor pain relief—particularly for people experiencing back or hip labor.
Let’s break down what a TENS unit is, how it works, how to use one during pregnancy, labor, and postpartum, and what to look for when choosing one.
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What Is a TENS Unit?
A TENS unit is a small, battery-powered device that delivers electrical stimulation through adhesive pads placed on your skin.
The sensation typically feels like a series of small electrical pulses or a tingling sensation. Some people describe it as similar to the feeling you get when your hand or foot starts to “fall asleep.”
The exact physiology behind TENS-related pain relief isn’t completely understood. However, there are two main theories that help explain why it may work.
1. The Gate Control Theory of Pain
The first explanation is the gate control theory of pain.
The basic idea is that your nervous system can only process so much sensory information at once. By introducing another strong sensation—such as the tingling stimulation from a TENS unit—you may essentially compete with the pain signals being sent to your brain.
Think about some of the other labor comfort techniques we use.
Massage, counterpressure, hip squeezes, movement, heat, and other sensory inputs can all provide your nervous system with something else to focus on. The goal isn’t necessarily to completely eliminate the pain. Instead, you’re changing the sensory information your brain is processing.
A TENS unit provides another form of stimulation through the electrical impulses.
When those impulses create a strong enough sensation, they may help “close the gate” to some of the pain signals traveling toward the brain.
This is one reason why TENS can be particularly helpful as part of a larger labor comfort toolkit. You’re giving your nervous system another sensation to process while you’re experiencing contractions.
2. Stimulating Your Body’s Natural Pain Relief
The second theory involves your body’s own natural pain-relieving mechanisms.
The electrical stimulation from a TENS unit stimulates the nerves, muscles, and fascia. This stimulation may encourage the body to release endogenous opioids, which are naturally produced substances that can help decrease pain.
One important consideration here is that this response may build over time.
This is one reason we don’t necessarily recommend waiting until you’re deep into active labor or transition to try a TENS unit for the first time.
If you think a TENS unit might be something you want to use during labor, consider starting it earlier rather than waiting until the contractions are extremely intense.
That doesn’t mean a TENS unit won’t work if you start it later. It simply may be more beneficial when you’ve been using it for a longer period of time.
Does a TENS Unit Actually Work for Labor Pain?
This is probably the biggest question people have.
Is a TENS unit actually effective, or is it just another trendy labor gadget?
The evidence supports TENS as a viable option for reducing pain during labor.
Importantly, however, it is essential to have realistic expectations.
A TENS unit is not an epidural.
With an epidural, the goal is to significantly decrease or eliminate the sensation of contraction pain. With a TENS unit, you’re still going to feel your contractions.
The difference is that the contractions may feel more manageable.
Instead of eliminating the sensation, TENS can reduce the reported intensity of the pain and give you another tool to help you cope with contractions.
This distinction is really important when you’re preparing for an unmedicated or minimally medicated birth.
You shouldn’t go into labor expecting a TENS unit to make contractions disappear. Instead, think of it as something that may help make the sensations less overwhelming while allowing you to remain mobile and actively participate in your labor.
TENS vs. an Epidural
TENS and an epidural are obviously very different types of pain relief.
An epidural provides regional anesthesia and can significantly reduce your ability to feel contraction pain. A TENS unit does not numb you.
With a TENS unit, you’ll continue to feel your contractions and pressure, but the pain may be reduced enough that you find the sensations more manageable.
One benefit of TENS is that you can remain mobile while using it.
In the research I found, people who used a TENS unit instead of receiving an epidural reported meaningful pain relief while also appreciating the ability to move and maintain more control over their bodies. Labor was also reported as approximately 45 minutes shorter in the TENS group compared with the epidural group.
Of course, this doesn’t mean that using a TENS unit will cause your labor to be 45 minutes shorter. Research findings shouldn’t be interpreted as a guarantee of what will happen in your individual birth.
The bigger takeaway is that TENS can provide meaningful pain relief while allowing you to maintain mobility.
TENS vs. IV Pain Medication
TENS has also been compared with IV pain medications.
The studies I came across were older, and it’s important not to oversimplify the comparison by saying that TENS is “just as good” as IV pain medication.
Both options can provide pain relief, but the experience is different.
With some of the longer-acting IV pain medications studied, people experienced side effects such as:
- Nausea
- Sleepiness
- Drowsiness
- Feeling less in control of their body
People who used TENS did not experience those medication-related side effects.
Because of this, some people preferred TENS even when the amount of pain relief was similar.
Ultimately, there isn’t one “best” pain relief method for everyone. Your preferences, your labor, your medical circumstances, and what matters most to you will all influence which options you choose.
Who Might Benefit Most From a TENS Unit?
TENS can be helpful for many people, but there is one group we particularly love it for:
People experiencing back labor.
Some people primarily feel contractions in the front of their abdomen. Others feel them strongly in their back, hips, or pelvis.
If your contractions are primarily felt in your back or hips, having electrical stimulation directly over those areas can be especially helpful.
Personal experience also matters.
For someone who consistently experiences back labor, a TENS unit may become one of their favorite labor comfort techniques. For someone who doesn’t typically feel much discomfort in their back, it may not be nearly as useful.
This is a great reminder that labor comfort is highly individual.
Just because your friend loved a TENS unit doesn’t mean you will. And just because someone else didn’t find it helpful doesn’t mean it won’t be a game changer for you.
When Should You Start Using a TENS Unit During Labor?
One of my biggest recommendations is this:
Don’t wait until the end of active labor to put it on.
If you’re planning to use a TENS unit, consider introducing it earlier in labor.
The idea is that the longer you use the stimulation, the more opportunity your nervous system has to respond to it.
You may begin using it during early labor and continue using it through active labor and transition.
Again, this doesn’t mean you can’t put it on later. It simply may not provide as much relief if you’re waiting until the intensity of labor is at its highest.
And because TENS is non-invasive and doesn’t involve medication, it can be a relatively easy option to have available early in your labor.
How to Use a TENS Unit During Labor
TENS units use adhesive pads that attach directly to your skin.
For labor, the typical placement is:
- Two pads on either side of the spine
- Two additional pads on the glute area
- Pads positioned between approximately the bra line and hip line
- Adjusting the pad placement throughout labor based on where you’re feeling the sensations
The exact placement may change as labor progresses.
Adjusting Pad Placement as Baby Descends
Early in labor, you may find that the most helpful placement is higher on your back and glutes.
As your baby descends through the pelvis, your sensations may shift lower.
You can then move the pads down your back and glutes to follow where you’re experiencing the most discomfort.
Eventually, all four pads may be positioned closer to the hip area.
The goal isn’t to follow one rigid placement map. Instead, use the pads strategically based on where you are actually feeling the labor sensations.
How to Adjust the Intensity During Contractions
One of the most important features of a labor TENS unit is the ability to change the intensity.
During a contraction, you’ll typically increase the intensity.
Between contractions, you’ll decrease it to a lower level.
You want to find an intensity that creates a noticeable tingling or buzzing sensation without being so intense that it prevents you from relaxing.
Then, when a contraction begins, you can increase the intensity to provide stronger stimulation.
Some TENS units require you to manually press the buttons multiple times to increase or decrease the intensity.
Others have a boost button, allowing you to increase the stimulation quickly during the contraction and then decrease it afterward.
This can be particularly useful during labor because you don’t want to spend your contraction trying to figure out how many times you need to press a button.
Can You Use a TENS Unit in the Shower or Tub?
This is an important safety consideration.
Most TENS units are not waterproof.
Electrical devices and water generally aren’t a great combination, so unless the specific device you’re using is designed and approved for water use, remove the TENS unit before getting into the shower or tub.
Some waterproof or water-resistant models may exist, but you should always follow the manufacturer’s instructions for your particular device.
If water is part of your planned labor comfort strategy, you can simply remove the TENS unit before getting into the water and put it back on afterward if appropriate.
Using a TENS Unit During Pregnancy
A TENS unit isn’t only useful during labor.
It can also be used during pregnancy for certain musculoskeletal aches and pains.
For example, you may use it on areas such as:
- The back
- The hips
- The wrists
- The shoulders
I recommend using it for approximately 20–30 minutes at a time for pregnancy-related musculoskeletal discomfort.
Where Should You NOT Use a TENS Unit During Pregnancy?
During pregnancy, avoid placing TENS pads on the abdomen or neck.
For pregnancy-related discomfort, keep the stimulation focused on areas such as the back, hips, or other appropriate areas where you’re experiencing musculoskeletal pain.
Always follow the instructions for your specific device and talk with your healthcare provider if you have questions about whether TENS is appropriate for your particular situation.
Using a TENS Unit Postpartum
One of the great things about a TENS unit is that its usefulness doesn’t end when your baby is born.
It can also be a helpful postpartum pain-management tool.
And there is one major difference between pregnancy/labor and postpartum use:
Postpartum is the time when you can use the TENS unit on the abdomen.
Post-Cesarean Pain
A C-section is major abdominal surgery, and managing pain while caring for a newborn can be challenging.
Using TENS above and below a C-section incision may help with postoperative pain.
Research has found potential benefits including:
- Lower reported pain scores
- Faster return of bowel function
- Improved overall postoperative comfort
- Better postoperative recovery scores
This makes TENS an interesting non-medication option to add to your postpartum pain-management toolkit.
Of course, TENS shouldn’t replace the pain-management plan recommended by your healthcare team. Instead, it can potentially be used as an additional tool.
Postpartum Uterine Cramping
You can also experience significant cramping after birth as your uterus contracts back toward its pre-pregnancy size.
These postpartum contractions—sometimes called afterpains—can be particularly noticeable during breastfeeding.
TENS may provide some relief for these uterine cramps.
Because you’re no longer pregnant, you can use the pads on the abdomen postpartum if appropriate.
Upper Back Pain From Feeding and Holding Baby
Postpartum isn’t just about recovering from birth itself.
You’re also suddenly spending a huge amount of time:
- Holding your baby
- Breastfeeding or bottle-feeding
- Looking down
- Sitting in awkward positions
- Rounding your shoulders
- Sleeping in unusual positions
All of this can contribute to upper back and shoulder discomfort.
A TENS unit may also provide relief when used over areas of muscular discomfort, such as the upper back.
How Many Pads Do You Need?
For labor, having a TENS unit with four leads/pads can be especially helpful.
A typical setup uses four pads:
- Two along the back
- Two over the glutes
Having four leads allows you to provide stimulation across both sides of your back and into the glute area.
For pregnancy or postpartum discomfort, you may not always need all four pads. Depending on the area you’re treating, two pads may be enough.
Some units also allow different channels to be controlled independently, which can be useful if you want a different intensity on your back compared with your glutes.
What Should You Look for When Buying a TENS Unit?
You don’t necessarily need the most expensive TENS unit available.
There are budget-friendly options that can still provide the basic features you’ll want during labor.
Here are the features we recommend prioritizing.
1. Battery Powered
A battery-powered unit is important for labor.
You don’t want to discover that your device needs to be recharged in the middle of a contraction.
Even better, look for a unit with replaceable batteries so you can keep backup batteries in your birth bag.
2. Multiple Intensity Levels
The ability to increase and decrease the intensity is essential.
You’ll likely want a lower intensity between contractions and a higher intensity during contractions.
3. Four Leads
For labor, look for a unit that can accommodate four pads.
This gives you more flexibility with placement over your back and glutes.
For pregnancy and postpartum use, you may be able to get away with a two-lead unit depending on how you intend to use it.
4. Easy One-Handed Control
This might seem like a minor detail, but it can make a big difference during labor.
You want a controller that’s small enough to hold comfortably and operate with one hand.
That way, you or your birth partner can easily increase or decrease the intensity without having to stop what you’re doing.
Your partner can even control the TENS unit with one hand while using the other hand to provide hip squeezes, counterpressure, massage, or other hands-on support.
5. Sticky, Durable Pads
Don’t overlook the adhesive pads.
The pads need to stay securely attached to your skin throughout labor.
Try the pads that come with your device and see how well they maintain their stickiness. If they’re not durable enough, you may want to purchase replacement pads.
Having extra pads available in your birth bag can also be helpful.
Bonus Features
Depending on your budget, there are additional features you might want to consider:
- A quick boost button
- Dual channels
- Water resistance, if specifically designed for water use
- A lanyard or wrist strap
- A backlit screen
- A contraction timer
These features aren’t necessarily required, but they can make a TENS unit easier to use during labor.
Our Favorite TENS Unit Features
The Babycare TENS line includes the OB TENS, Elle TENS+, and Elle TENS 2.
These models include many of the core features we look for in a labor TENS unit:
- Battery power
- Multiple intensity levels
- Four leads
- One-handed control
- A lanyard for easy access
The OB TENS is the simplest and most budget-friendly option within that line.
The Elle TENS+ adds dual-channel functionality and additional technology designed for labor pain relief.
The Elle TENS 2 includes additional features such as a backlit screen and an integrated contraction timer that keeps track of the last five contractions.
The important thing to remember, though, is that you don’t need the fanciest model to benefit from TENS.
A less expensive device that has the essential features can still be a valuable addition to your birth toolkit.
How Much Does a TENS Unit Cost?
There are a variety of options available at different price points.
Budget-friendly units can often be found for around $30–$40, while specialty maternal TENS models may range from approximately $70 to over $100.
If you’re purchasing one specifically for labor, focus first on the features rather than simply choosing the most expensive option.
Depending on your insurance plan, a TENS unit may also be eligible for coverage or reimbursement through an HSA or FSA.
A TENS Unit Can Be a Versatile Addition to Your Birth Toolkit
One of our favorite things about a TENS unit is that it isn’t a one-time-use labor tool.
You can potentially use the same device during:
Pregnancy → Labor → Postpartum
During pregnancy, it can provide relief for certain musculoskeletal aches and pains.
During labor, it can provide another layer of sensory input to help manage contractions, especially if you’re experiencing back or hip labor.
After birth, it may help with C-section incision pain, uterine cramping, and other muscular discomfort.
That versatility can make it feel like a worthwhile investment even if you aren’t sure how much you’ll use it during labor.
Is a TENS Unit Right for Your Labor?
Like every labor comfort technique, a TENS unit is highly individual.
Some people absolutely love it.
Others try it and decide that the sensation isn’t helpful for them.
If you tend to experience back labor, a TENS unit may be particularly worth trying.
If you’re planning an unmedicated birth, it can also be a useful tool to have available because it doesn’t prevent you from moving, changing positions, using other comfort measures, or changing your birth plan later.
And that’s ultimately how we recommend thinking about labor comfort tools:
You don’t have to commit to using something simply because you packed it in your birth bag.
Having options gives you flexibility.
You can try the TENS unit and see how it feels. If you love it, keep using it. If you don’t, switch to another comfort technique.
You can combine it with movement, breathing, massage, hip squeezes, counterpressure, heat, water, and other strategies.
Final Thoughts
A TENS unit can be a surprisingly versatile tool for pregnancy, labor, and postpartum recovery.
While we don’t completely understand the physiology behind its pain-relieving effects, two primary theories involve the gate control theory of pain and stimulation of the body’s endogenous pain-relief mechanisms.
Research supports TENS as a useful option for reducing pain during labor. It won’t eliminate contractions like an epidural, but it can make the sensations more manageable while allowing you to remain mobile.
It may be particularly helpful for people who experience pain in their back and hips.
If you plan to use one during labor, consider introducing it earlier rather than waiting until transition. During labor, you can increase the intensity during contractions and decrease it between contractions.
And don’t forget that the usefulness of a TENS unit doesn’t end when your baby is born. It may also provide relief for postpartum cramping, C-section pain, and muscular discomfort from all of the feeding and baby-holding that comes with new parenthood.
When shopping for a TENS unit, prioritize the basics: battery power, adjustable intensity, four leads, durable adhesive pads, and a controller that’s easy to operate with one hand.
The goal isn’t to find the most expensive device. It’s to find one that fits your needs, your budget, and your birth preferences.
A TENS unit may not be the right labor comfort tool for everyone—but if you’re preparing for birth, especially if you anticipate back labor, it can be a valuable option to have in your toolkit.
You may discover that it’s one of those simple tools you didn’t realize you needed until you’re in labor.
Note: This article is intended for educational purposes. Always follow the instructions for your specific TENS device and talk with your healthcare provider about whether and how TENS is appropriate for you, particularly during pregnancy, labor, or after a C-section.
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