The gel used to conduct the sound waves is at room temperature and may momentarily feel cool to the skin when it is initially applied. Most patients feel a pleasant and relaxing warmth below the surface off the skin during the actual treatment.
 
Why is Ultrasound used?

Ultrasound treatment can be administered directly to the area of complaint, penetrating deeply into the body. The rise in temperature increases blood flow, relaxes muscle spasms, massages damaged tissues, and speeds the healing process.