-The long-term effect of chronic electrical stimulation is unknown.
-TENS EMS unit should not be applied to the carotid sinus nerves, particularly in patients with a known sensitivity to the carotid sinus reflex.
-TENS/EMS unit should not be applied over the neck or mouth. Severe spasm of the laryngeal muscle may occur, and the constructions may be strong enough to close the airway or cause difficulty in breathing.
-TENS/EMS unit should not be applied onto the chest near the heart in that the introduction of electrical current into the heart may cause cardiac arrhythmias.
-TENS/EMS unit should not be applied trans-cerebrally.
-TENS/EMS unit should not be applied over swollen, infected or inflamed areas or skin eruptions, e.g., phlebitis, thrombophlebitis, varicose veins, etc.
-TENS/EMS unit should not be applied over or in proximity to cancerous lesions.-TENS/EMS unit should not be used on pregnant women.
-TENS/EMS unit should not be used on people with a pacemaker or with any heart condition.
-TENS/EMS unit should not be used on people who have epilepsy or mental diseases.