Wearables for health is a booming industry. In the near future your Apple Watch or Fitbit could flag changes or symptoms you are experiencing. A much harder goal is determining what illness you actually have. From The Verge:

Hirten’s research showed that Apple Watches could detect changes in the heart rate variability of healthcare workers up to seven days before they were diagnosed with COVID-19. Heart rate variability, which tracks the time between heartbeats, is a good proxy for how the nervous system is working, he says. “Often it seems to be very telling of something going on in the body, even before people realize something is happening.”

“Something like COVID-19 is much more complicated. You’re trying to look for alternative markers in the body that track viral illness,” he says. “But it’s a lot more complicated because those markers also track other things going on in the body.”

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