TENS stands for Transcutaneous Electrical Nerve Stimulation and is a non-medical form of pain relief used in labour.
A TENS machine is a small battery operated device that has leads connected to sticky electrode pads that you place on your skin.
It is a form of non-pharmacological pain relief that works by administering gentle electrical impulses that interrupt the pain signals from the brain and boosts endorphins (the body's natural pain relief hormone).
TENS is commonly used in labour, and is safe for both mother and baby. It is often described as a buzzing or tingling sensation, and most women find it very soothing.