- irritation or rash, caused by the adhesives in the electrodes or the tape holding the electrodes in place. Overusing electrotherapy may cause a burning feeling in the skin. =) duration of therapy should be followed closely to avoid a problem.
- buzzing, tingling or prickling sensation, which some people may find uncomfortable
- allergy to the adhesive pads
- Placing the pads over the heart or over pacemaker leads could cause cardiac arrhythmia and placing them over a pregnant woman's abdomen could cause fetal damage.
It is vital never to place the electrodes on either the front of the neck or the eyes. Putting electrodes on the neck can lower blood pressure and cause spasms. On the eyes, the electrodes can increase pressure within the eye and possibly cause an injury.
Electrical stimulation from a TENS machine can cause pain and twitching in the underlying muscles if you adjust the intensity too high. Lower the intensity until you feel just a strong tingling sensation, without muscle twitching. Prolonged use, even at lower intensity levels, may occasionally cause mild muscle soreness. For this reason, it is usually recommended that a TENS machine not be used for more than a few hours at a time.
Never place the pads over:
- the front or sides of your neck - your temples - your mouth or eyes - your chest and upper back at the same time - irritated, infected or broken skin - varicose veins - numb areas