Musculoskeletal conditions, such as muscle strains and tendonitis, can be treated with ultrasound by a physical therapist. Ultrasound is applied using a wand or probe that is put in direct contact with the patient’s skin. A set of high frequency sound waves pass through the skin and cause a vibration of the local tissues that cause a deep heating in that area, though patients don’t usually feel the heat. Ultrasound therapy is effective in reducing local inflammation, as well as promoting circulation to aid in tissue healing, pain relief, and decreasing muscle spasm. The intensity of the ultrasound can be adjusted depending on the desired effect.