Increased heart rate with decreased SpO2 commonly precedes diagnosis of respiratory infection. Increased heart rate alone is often seen as a warning to run path

Increased heart rate with decreased SpO2 commonly precedes diagnosis of respiratory infection. Increased heart rate alone is often seen as a warning to run pathology labs before beginning chemotherapy which can destroy neutrophils. Something you don't want to do if the patient is in the beginning stages of an infection. I'm not a doctor I've just been around this stuff more than I wish to. Frankly I wish the Apple watch was more aggressive in reporting anomalies to the user. Something as simple as "we noticed your heart rate always increases at this place and time" can make the user aware that something is wrong in their life... assuming it's not a gym.