What should you know about interferential TENS unit?

The device connects to adhesive electrodes placed around, rather than directly over, the painful area. Two currents may cross in the tissues, creating a low-level sensation that can alter how pain signals are processed. People often feel tingling or pulsing; it should not feel sharply painful. The effect varies, and stimulation does not repair a fracture, remove infection or identify the cause of pain.

A physiotherapist may combine stimulation with movement practice, activity changes, manual treatment or other rehabilitation. Electrode position and intensity depend on the body region, skin condition and treatment goal.

Use the settings and session length recommended by your clinician. Check the skin before and after use, keep electrodes clean, and stop if there is burning, a rash, worsening pain or unusual numbness. Do not place electrodes over broken or infected skin, the front of the neck, the head or across the chest. Keep the device away from water and do not use it while driving or sleeping unless specifically instructed.

Tell the clinician about a pacemaker or other implanted electrical device, reduced sensation, pregnancy, epilepsy or significant skin problems before treatment. A home unit should be demonstrated so you know where pads belong and how to adjust intensity.

Seek prompt medical assessment for new weakness, spreading numbness, loss of bladder or bowel control, severe pain after an injury, or a limb that becomes cold or changes colour. Stop stimulation and contact your clinician if it causes a persistent skin reaction, palpitations, dizziness or symptoms that are clearly worsening.

Ask what pain problem the unit is intended to address, where each electrode should go, how often to use it and what improvement to track. Confirm whether your medicines, implanted devices or skin condition change the advice.