The type of electrotherapy you receive will depend on your individual injury and the stage of healing. TENS and Ultrasound are the most common types of electrotherapy. TENS is a method of electrical stimulation which aims to provide pain relief by stimulating the sensory nerves and modulating pain. Ultrasound is an electrotherapy that promotes healing and reduces inflammation at a cellular level. An ultrasound machine creates mechanical sound waves that produce energy, which when they enter the skin cause micro vibrations in the cells improving tissue healing and reducing pain. Electrotherapy is combined with other treatment techniques such as manual therapy and exercise for the best possible results.