​Researchers have found that transcutaneous electrical nerve stimulation (TENS)

A) ​is effective for acute but not chronic pain.
B) ​increases pain during stimulation, but patients report less pain after stimulation.
C) ​is not found to be very effective for relieving pain.
D) ​has no advantage over other medical methods.

Transcutaneous Electrical Nerve Stimulation

A method of pain relief involving the use of a mild electrical current passed through the skin via electrodes.

Chronic Pain

Persistent pain that lasts longer than the usual course of acute illness or injury or for more than three to six months, often affecting an individual's well-being and daily activities.