 But all of this buzzy tech could have an impact on public health, too. Residents of the small town of Granbury, Texas, say Bitcoin is more than just a figurative headache for them. Soon after a company opened up a Bitcoin mine there a couple years ago, locals started experiencing excruciating migraines, hearing loss, nausea, panic attacks, and more. Several folks even ended up in the emergency room. And the culprit behind these symptoms may surprise you.