Does a TENS machine help pain?

What is TENS?

Transcutaneous electrical nerve stimulation (TENS) uses a small battery-powered device connected to sticky pads placed on the skin. It delivers mild electrical pulses that create a tingling sensation. People can adjust the intensity, frequency and pattern of stimulation.

TENS is thought to reduce pain by stimulating nerves that block pain signals in the spinal cord and by encouraging the release of the body's natural pain-relieving chemicals.

What does the evidence show?

A systematic review and meta-analysis of 381 randomised trials with 24,532 participants found moderate-certainty evidence that pain intensity was lower during or immediately after TENS than with placebo, across acute and chronic pain conditions 1.

Pain was also lower during or immediately after TENS than with some standard medicines and non-drug treatments, based on low-certainty evidence. Adverse events were poorly reported but generally mild and not different from comparison treatments 1.

Why does UK guidance not recommend TENS for chronic primary pain?

UK guidance on chronic pain recommends against offering TENS for people with chronic primary pain, a type of long-term pain that is not explained by another condition, such as fibromyalgia or chronic widespread pain 2. The guideline focuses instead on exercise, psychological therapies and, for some people, acupuncture or certain antidepressants.

The difference reflects that TENS effects are mainly short term, during or immediately after use, and that evidence for lasting improvements in chronic primary pain, quality of life and function is limited.

When might TENS be useful?

TENS may help some people with acute pain, such as labour pain, musculoskeletal pain or pain after surgery, and as a self-management tool to ease flare-ups of pain so that people can stay active or do exercises.

Because it is inexpensive, low-risk and under the user's control, some people find it helpful as one part of a wider pain management plan.

How is TENS used safely?

Place pads on clean, intact skin around the painful area, avoiding the front of the neck, eyes, head in people with epilepsy, and broken or numb skin. Start at a low intensity and increase until a strong but comfortable tingling is felt.

Do not use TENS while driving or operating machinery, or in water. Check the skin under the pads for irritation.

What settings are commonly used?

TENS units usually allow changes in pulse frequency, pulse width and intensity. Many people start with a comfortable, strong tingling that does not cause muscle twitching or pain. Some devices offer preset programmes for different types of pain.

There is no single correct setting for everyone. Trying one setting for several sessions before changing, and noting how pain responds during and after use, helps people find what suits them. A physiotherapist can demonstrate pad placement and settings.

How does TENS fit with other pain treatments?

TENS is most useful as a support for staying active rather than as a standalone treatment. For example, some people use it before a walk or exercise session so that they can complete their programme with less discomfort.

Medicines, exercise, sleep, pacing and psychological approaches remain important parts of managing persistent pain. If TENS allows people to reduce reliance on other treatments, any changes to medicines should be discussed with a doctor.

Who should not use TENS?

People with a pacemaker, implanted defibrillator or other implanted electronic devices, and people with certain heart conditions or epilepsy, should seek medical advice before using TENS. During pregnancy, TENS should not be used over the abdomen except under specialist guidance for labour.

Seek medical assessment for new, severe or unexplained pain rather than relying on TENS.

Frequently asked questions