What does TENS unit stand for?

A TENS unit is a small battery-powered device connected to adhesive electrodes. When switched on, it delivers pulses through the skin. Depending on the programme, you may notice tingling, tapping, or a mild rhythmic sensation. The aim is symptom relief; TENS does not establish the cause of pain or replace treatment for an injury or disease.

The electrodes are placed on healthy skin around a painful area, with spacing and positions guided by the device instructions or a clinician. They should not be placed on broken skin, the front of the neck, the head, or across the chest.

Read the instructions, check the leads and pads, and begin with a low comfortable setting. Keep the skin clean and dry, and turn the unit off before moving or removing electrodes. Do not use TENS while bathing, sleeping, driving, or exercising unless specific guidance says it is appropriate.

Get advice first if you have a pacemaker or another implanted electrical device, reduced sensation, a seizure history, pregnancy, or recent surgery. Stop if stimulation is painful or the skin becomes irritated. A physiotherapist can help match the programme and pad position to your symptoms.

Seek urgent care for severe pain after injury, new weakness, loss of feeling, major swelling or deformity, chest discomfort, fainting, or difficulty breathing. Arrange a clinical review when pain persists, worsens, keeps returning, or comes with fever or other new symptoms. Relief from TENS should not hide a symptom that needs examination.

Ask whether TENS is suitable for your diagnosis, where the electrodes should be placed, which intensity is reasonable, and how long to use it. Ask what improvement to expect, when to stop, and which exercises or treatments should accompany it.