What Is a TENS Machine?
TENS stands for Transcutaneous Electrical Nerve Stimulation. A TENS machine is a small, battery-powered device that sends mild electrical impulses through pads (electrodes) stuck to the skin. These impulses are thought to work in two ways: by stimulating the body to produce natural painkillers called endorphins, and by interrupting or reducing pain signals travelling to the brain. TENS is widely used in the UK for chronic pain, arthritis, back pain, nerve pain, and during labour.
Does TENS Actually Work?
The evidence for TENS is mixed. Some clinical studies show significant pain reduction, while others show little benefit beyond placebo. However, many physiotherapists and pain specialists recommend TENS as part of a broader pain management strategy because it is safe, drug-free, and has minimal side effects. The NHS acknowledges that TENS may help some people and suggests trying it alongside other treatments. Many people find it particularly helpful for osteoarthritis pain, lower back pain, and period pain.
Types of TENS Machine
Basic TENS machines: Simple devices with adjustable intensity and one or two programme modes. Good for people new to TENS who want to try it without a big investment. Prices from £15-30. The TensCare Perfect TENS and Elle TENS are popular UK entry-level models.
Dual-channel TENS: Have four electrode pads instead of two, allowing you to treat two areas simultaneously or cover a larger area. More versatile for people with pain in multiple locations. From £25-60.
TENS with EMS (muscle stimulation): Combination devices that offer both pain relief (TENS) and muscle strengthening (EMS) programmes. Useful for rehabilitation after injury or surgery. From £30-80.
Wireless TENS: Compact units that attach directly to the electrode pad without separate wires, making them discreet enough to wear under clothing while active. The iTENS and Beurer EM 70 are examples. From £40-100.
How to Use a TENS Machine
Clean and dry the skin where you will place the pads. Position the electrodes on or around the painful area (never directly on the spine, over the heart, on the front of the neck, or on broken skin). Start at the lowest intensity and gradually increase until you feel a strong but comfortable tingling. A typical session lasts 20-60 minutes and can be repeated several times a day. Replace electrode pads every 20-30 uses or when they lose stickiness.
Who Should Not Use TENS
TENS should not be used by people with a pacemaker or other implanted electrical device, during the first 12 weeks of pregnancy (though it is widely used during labour), over cancerous tumours, or by anyone with epilepsy without medical advice. Always consult your doctor or physiotherapist before starting TENS if you have any underlying health conditions.
Where to Buy and NHS Access
TENS machines are available from pharmacies (Boots stocks several models), Amazon, and specialist retailers. Some NHS physiotherapy departments lend TENS machines for a trial period before you decide to buy one. If prescribed by a healthcare professional for a qualifying condition, TENS machines and pads are VAT-exempt.