TENS units are effectively used by Pelvic Floor Therapists to treat conditions such as Interstitial Cystitis, Dysmenorrhea and Prostatitis, to name a few.  TENS units has also been used to help relieve labor pains.   The TENS electrodes come in Foam or Cloth in 2″x 2″ or 2″x 4″ sizes and 4 to a package.