Apple Watch Vitals App Can Predict Illness Days Before Symptoms Appear

The Vitals app on the Apple Watch, introduced with watchOS 11, is being praised by users for its ability to predict when they will become sick. Users have noted that the app warned them of potential illness up to three days before they started feeling unwell. The Vitals app monitors a variety of health metrics during sleep, including heart rate, respiratory rate, blood oxygen levels, and skin temperature. If an unusual reading is detected, the user is notified.