Phonophoresis is a treatment modality often used during physical therapy treatments. This method of treatment uses sound waves from an ultrasound machine along with medicated gels. The medications are applied directly to the skin, while the ultrasound works to help pass the medicine through the skin into the affected areas of the body. Phonophoresis is considered an anti-inflammatory treatment and is used most often to treat muscle, ligament, tendon, and soft tissue inflammations. Inflammation occurs in the body after injury and is part of the body's natural healing process. The signs and symptoms of inflammation include redness, swelling, and pain on and around the inflamed body part.