Apple's new Vitals app for watchOS 11 appears to be impressing some users with its ability to detect potential illness days before

Here is how the Apple Watch is actually able to tell when 'you're sick' days before you begin to experience symptoms.

The Apple Watch has long been praised for its ability to keep users in tune with their health, from catching disorders such as sleep apnea to offering advanced fall detection and crash alerts. Some users have even credited it with saving their lives,