I just discovered that my watch can detect if I am sick or not! Last week I got an infection, feel cold when temperature was actually warm or ok, a slight fever. The graph of the stress level started to going up, no matter that I spent most of the day on bed to get a faster recovery, finally I got to the doctor and got a shot of antibiotics, and since then the graph started to go down. Actually I could predict the day I will be already recovered based on the stress graph! My RHR also increased during that period, but it was more clear to see the trend by looking at the stress graph.
It may be a good idea to have a a kind of health alert when the trends indicate something is going wrong, working like the stress widget.
On the graph I am attaching you can see clearly that I have an average of 25 of stress, but on February 27 it started to climb.
