I have one sore spot. Why can't my therapist just hold the ultrasound right on it, instead of rubbing it around?

If the transducer is held in one spot for too long, it can magnify the effect of the ultrasound. Sound waves going in can crash into sound waves that are on their way out, forming a single wave that is twice as large. This increases the intensity of the treatment, creating too much sound and heat in the underlying tissues. Cells can be damaged, slowing down your healing time and causing pain and inflammation.

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