No! The intensity of the electrical muscle stimulation or sensory nerve stimulation is easily modifiable and ultimately will only be as much as you, the patient, can tolerate. Typically, electrical stimulation will feel tingly or prickly (some patients describe it as a comforting “pins and needles” sensation). Sometimes, as in the case when used for muscle strengthening, the intensity level can be high and somewhat uncomfortable, but it should never cause pain.