How to use a TENS unit, from first pad to last switch-off
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- Preset-based OTC TENS unit. Best for: First-time users who want to set intensity only. See options on Amazon
- Two-channel unit with adjustable rate, width and timer. Best for: People working with a physical therapist who has given exact settings. See options on Amazon
- Spare pads with storage tray. Best for: Anyone using TENS regularly. See options on Amazon
Before your first session
The NHS recommends checking with a GP or other healthcare professional before you start, and seeing one first if you do not know what is causing your pain. Cleveland Clinic lists people who should not use TENS: anyone with a pacemaker or other implanted device, pregnant people, and people with epilepsy, cancer, deep vein thrombosis, bleeding disorders or heart disease.
Then read the manual that came with your unit. Units differ in buttons, presets and limits, and the NHS points readers to the leaflet with the machine for session details.
Step by step
These steps follow the order the NHS gives, with practical detail added.
- Clean the skin. Wash and dry the area. Skip lotion there.
- Turn the unit off and make sure every intensity dial or level is at zero.
- Connect the wires to the unit and to the pads. The TENS 7000 reference manual says to make sure lead wire pins are fully inserted with no bare metal showing.
- Place the pads on clean skin near the painful area, with a gap between them. OMRON's pad instructions say at least one inch apart, never touching or overlapping. Our placement chart has layouts by body area.
- Choose a mode or preset. If your clinician gave you settings, use those.
- Switch on and raise intensity slowly until you feel a tingling sensation that is not painful. Cleveland Clinic describes the target as strong but comfortable.
- Set or check the timer and relax while it runs.
- Turn the unit off before removing the pads, then put the pads back on their plastic backing.
What the settings mean
Many home units hide the technical settings behind presets, but two-channel units often let you change them. Using the TENS 7000 reference manual as an example of what you may see:
| Setting | What it changes | Example range from the manual |
|---|---|---|
| Pulse rate (Hz) | How many pulses per second | 2 to 150 Hz; 70 to 120 Hz suggested unless instructed otherwise |
| Pulse width (µs) | How long each pulse lasts | 50 to 300 µs; 70 to 120 µs suggested unless instructed otherwise |
| Mode | The pattern of pulses | Burst, Normal, Modulation and two strength-duration modes |
| Timer | Session length | 1 to 60 minutes, or continuous |
Change one setting at a time so you can tell what made a difference. The same manual advises that if results are not positive at first, talk to your physician about other settings or pad placement.
What it should feel like
A good session feels like a steady buzz, tapping or pulsing under the pads. It should never sting, burn or make muscles cramp hard. Over a session the sensation may fade as you get used to it; you can nudge the intensity up a little, but do not keep raising it to chase relief.
Cleveland Clinic lists uncomfortable prickling or tingling, adhesive allergy and, rarely, electrode burns as possible side effects, and says to tell your provider about rash, itching, dizziness, headaches or nausea. The NHS says that if skin becomes itchy, irritated or red, turn the machine off and remove the pads.
Common mistakes
- Turning the unit on with the dial already high. Always start from zero.
- Pads too close together or touching.
- Using TENS while asleep, in the bath or shower, or while driving. The NHS says not to.
- Placing pads on the chest and back at the same time, or on the neck, mouth or eyes.
- Pulling pads off while the unit is still running.
- Using worn pads that no longer stick. See our guide to TENS unit pads.
For session length and frequency, read how often you can use a TENS unit.
What to look for when you buy
Preset-based OTC TENS unit
Best for: First-time users who want to set intensity only
Body-area presets let you follow the steps above without learning pulse settings. Start low and raise slowly.
Watch out: Less room to adjust if a preset does not suit you.
See options on AmazonTwo-channel unit with adjustable rate, width and timer
Best for: People working with a physical therapist who has given exact settings
Adjustable pulse rate and width let you match a clinician's plan. The TENS 7000 manual, for example, lists 2 to 150 Hz, 50 to 300 µs and a 1 to 60 minute timer.
Watch out: More settings mean more chances to get confused; write down what works.
See options on AmazonSpare pads with storage tray
Best for: Anyone using TENS regularly
Fresh pads that stick well give even contact, and storing them on their backing keeps the gel clean.
Watch out: Match the connector type to your lead wires.
See options on AmazonQuestions people ask
- How do I know if my TENS unit is working?
- You should feel a tingling or pulsing under the pads. If you feel nothing at normal levels, check that wires are fully plugged in and pads are sticking.
- What setting should I use on a TENS unit?
- Use your clinician's settings or the maker's preset for that body area. Intensity should feel strong but comfortable, never painful.
- Can I move around while using TENS?
- Gentle movement around the house is usually fine if the pads stay put and the wires do not snag. The NHS says not to use it while driving or using tools or machinery.
- Should I turn off the TENS unit before removing pads?
- Yes. Turn it off first so you do not get a jolt as the contact changes.
Sources
- TENS (transcutaneous electrical nerve stimulation) (nhs.uk), NHS
- Transcutaneous Electrical Nerve Stimulation (TENS) (my.clevelandclinic.org), Cleveland Clinic
- TENS 7000 Reference Manual (cdn.shopify.com), Roscoe Medical
- Long Life Pads, Standard (PMLLPAD) (omronhealthcare.com), OMRON Healthcare