TENS, or transcutaneous electrical nerve stimulation, is one of the most asked-about tools in my clinic for period pain and chronic pelvic pain. People want to know if it works, where to put the pads, whether it's safe to use on the abdomen, and which device is worth buying.
This guide answers those questions the way I'd answer them in clinic. It covers the research, the practical use, the contraindications, and how a wearable TENS device fits into a real pelvic health plan rather than promising to fix the underlying problem.
I'm Jade, the founder of Blossom Pelvic Health, and an APA titled Sports & Exercise Physiotherapist with a special interest in pelvic health. I recommend TENS to patients regularly. I also have strong opinions about how it should be used.
How does a TENS machine actually work?
A TENS machine sends mild electrical pulses through sticky electrodes placed on the skin. The pulses don't reach deep tissue. They work at the nerve and spinal-cord level, in two ways.
First, they activate large-diameter sensory nerves. When those nerves fire, they crowd out pain signals trying to travel up the spinal cord to the brain. That's the pain gate idea, and it's the mechanism most TENS programs are tuned for.
Second, some frequencies trigger a small release of endorphins, the body's own pain-modulating chemicals.
What TENS doesn't do: it doesn't treat the cause of the pain. It doesn't shrink endometriosis, relax a tight pelvic floor, or rebalance hormones. It changes how loudly the pain signal is being heard while the device is on. That's a real benefit when used well. It's also worth being clear-eyed about so the expectations are right.
Does a TENS machine help period pain?
For primary dysmenorrhoea, the cramping that isn't caused by an underlying condition, TENS has decent evidence. A 2002 Cochrane review (Proctor et al.) found high-frequency TENS over the lower abdomen effective for primary dysmenorrhoea, and several trials since have reinforced that finding. The Australian Journal of General Practice has also discussed TENS as a non-drug option in dysmenorrhoea management.
A few honest notes from clinic. It doesn't work for everyone. The benefit is usually moderate, not dramatic. And it works best when you start at the first hint of cramps rather than trying to dig out of a pain spike that's already at its peak. Wear it through the worst hours, take it off when you don't need it, and don't expect it to replace a heat pack, ibuprofen if that's safe for you, or rest.
Can a TENS machine help endometriosis pain?
TENS doesn't treat endometriosis. The disease itself needs proper medical management. That usually means a gynaecologist, sometimes an excision surgeon, often a hormonal pathway, and almost always a pelvic floor physio if there's overactive pelvic floor along with it.
What TENS can do is take some of the edge off during flares. A lot of people I see with endo find it useful for the lower abdominal cramping, low back ache, and referred upper-leg pain that come with their cycle. It's low-risk and non-pharmacological, which makes it easy to add into an already-busy treatment plan.
If your pain doesn't sit cleanly in the cramping pattern, if it's deep, sharp, or tied to specific positions or activities, the bigger question is whether your pelvic floor is part of the picture. Worth reading: understanding overactive pelvic floor muscles in endometriosis.
Where do you place TENS pads for period pain?
Two placements cover most situations.
For cramping in the lower abdomen, place the pads horizontally on either side of the belly button, below the navel and above the pubic bone. Keep them at least a couple of centimetres apart so the current has somewhere to travel through. Don't put electrodes directly over the pubic bone.
For period pain that radiates into the lower back, place the pads either side of the spine at the waist, not directly on the spine itself. Some people do best with pads on the abdomen and the back at the same time. Most wearable units can be set up for both.
Start at low intensity. Bring it up gradually until the sensation feels strong but comfortable. If it ever feels painful, pull it back down.
Can a TENS machine help overactive bladder?
This is a separate use, and it needs separate guidance.
The TENS protocol for overactive bladder isn't pads-on-abdomen. It typically targets either the posterior tibial nerve (just above the inner ankle bone) or the sacral nerves at the very base of the spine. Done correctly, it can help calm an overactive bladder reflex over a course of treatments, usually eight to twelve sessions before you'd expect to see meaningful change.
Done with the wrong placement or the wrong parameters, it does nothing. This is one I'd ask a pelvic floor physio to set you up with rather than self-prescribe. If urgency, frequency, or sudden need-to-go episodes are what brought you here, start with the common symptoms of overactive bladder and book in with a physio who treats continence.
Who should not use a TENS machine?
There are a handful of hard contraindications. Don't use TENS if you have:
- A cardiac pacemaker or implanted defibrillator - the current can interfere with the device.
- Other implanted electrical devices - same reason.
- Active cancer in the treatment area - electrical stimulation over tumour tissue isn't appropriate.
- Undiagnosed pain - get the diagnosis first. Numbing the signal before you know what's causing it is a bad trade.
- Broken or irritated skin under the electrode pads.
Use with caution, and ideally with clinical guidance, if you have epilepsy, significant cardiac arrhythmias, impaired skin sensation, or active skin conditions in the treatment area.
In pregnancy, TENS over the abdomen isn't recommended. TENS for labour pain is a different conversation. Obstetric TENS units are designed for use over the lower back during labour, and many Australian maternity hospitals stock them.
Electrode pads should never go over the front of the neck (the carotid sinus), across the front of the chest, near the eyes, or on broken skin.
Is a wearable TENS machine worth it?
If you want a TENS machine that's small, app-controlled, and easy to wear under clothing, a wearable unit can be a sensible choice. The trade-off versus a standard wired TENS machine is usually flexibility. Wired units tend to give you more independent control over frequency, pulse width, and pad placement. Wearable units optimise for being discreet and simple.
Two practical points before buying.
If you want a TENS machine specifically as part of physiotherapy treatment, for chronic pelvic pain, endometriosis, post-surgical pain, or labour preparation, look for a TENS machine that's listed on the Australian Register of Therapeutic Goods (ARTG). The NeuroTrac analgesic and obstetric TENS units we stock are ARTG-listed and routinely used by Australian physiotherapists in clinic.
If you want a wearable for general comfort during your period and you're happy to work alone with it, the Tap 2.0 wearable electrotherapy device is what most of our customers are asking about when they say "wearable." It runs five stimulation modes, has sticky-pad and dual-electrode wear options, and is designed to fit into daily life. It's discreet enough to wear at your desk. Many people find it useful through their cycle.
You can see the full range of electrotherapy and biofeedback devices we stock, with the device class noted on each product page.
How I use TENS in clinic
I don't treat TENS as a stand-alone fix. I use it as part of a broader plan that almost always includes movement, pelvic floor work appropriate to whether the floor is weak or overactive, education about pain, and sleep and stress factors that quietly turn the dial on pain perception. For people whose pelvic floor needs strength work as well as symptom relief, biofeedback can be just as useful as TENS. See the Perifit vs Elvie comparison for what those look like.
TENS is a good tool. It's not a miracle device. Used well, meaning the right placement, the right intensity, and the right expectations, it can take a real edge off period pain and pelvic pain. It also gives people something they can do for themselves on the days when nothing else has worked.
If you're not sure whether TENS is the right fit for what you're dealing with, that's a fair conversation to have with a pelvic floor physio before you spend the money.
