• On or near the eyes
• In the mouth
• Transcerebrally (on each temple)
• On the front of the neck (due to the risk of acute hypotension through a vasovagal reflex)
• On areas of numb skin/decreased sensation
• On broken skin areas or wounds
• On or near the trigeminal nerve if you have a history of herpes zoster induced trigeminal neuralgia (Postherpetic neuralgia)

Do not turn your TENS Unit up too high as this can cause over-stimulation which may make pain worse. There should be no muscle contraction.

TENS Units should also be used with caution in people with epilepsy or pregnant women (do not use over area of the uterus as the effects of electrical stimulation over the developing fetus are not known). TENS should not be used by people with an artificial cardiac pacemaker due to risk of interference and failure of their implanted device. Possible failure of these warnings can result in a cardiac arrhythmia.

DO not use electronic muscle stimulation if you are pregnant. Infant heartbeat manipulation can occur. Never use an EMS device across your chest. It can put you into cardiac arrest.

In the situation where low frequency (or acupuncture-like) TENS Unit is being used, it is necessary to increase the intensity of the stimulation to the point where a demonstrable muscle twitch is evident. This 2-6Hz (pulses per second) output increases the systemic release of endorphins which in turn cause pain relief.

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