Ultrasonic sounds (above 20 kHz) can cause physical symptoms in humans, particularly at high intensities ((>75\text{ dB})), including headaches, dizziness, nausea, ringing in the ears (tinnitus), and fatigue

Animal studies have demonstrated internal tissue alterations at specific frequencies and intensities

https://www.nature.com/nature-index/topics/l4/ultrasonic-exposure-effects-on-human-health