When I looked up ultrasound on Wikipedia I saw a link to this:
WASHINGTON (AP) -- Exposure to ultrasound can affect fetal brain development, a new study suggests. But researchers say the findings, in mice, should not discourage pregnant women from having ultrasound scans for medical reasons.
When pregnant mice were exposed to ultrasound, a small number of nerve cells in the developing brains of their fetuses failed to extend correctly in the cerebral cortex.
As science gets better and better I predict that we will find that humans are quite susceptible to little things like this.
I ended up spraying some Therapain Plus on the shoulder. Seems to work great for my back pain too.