One of the most common electrotherapy treatments is Transcutaneous Electrical Nerve Stimulation (TENS). This makes use of small devices which deliver pulses of electrical stimulation. The goal of the TENS machine is to stimulate sensory nerves to achieve pain relief and is often used for both nerve pain and chronic pain conditions.
Therapeutic Ultrasound in physiotherapy uses a deep heating effect on different tissues — like muscles, ligaments, and tendons — to boost circulation and stimulate the healing process. This method makes use of a transducer instead of electrode pads and is often used to treat muscular strains and sprains and tendonitis.
With all electrotherapy modalities, they are natural and so do not give you the side effects that you would have with medication.
Your clinician will be able to explain if this is recommended for you.