Behavioral health issues like depression and more serious conditions like bipolar disorder don’t often manifest with the kinds of clear, outward symptoms that presage something like the common cold. 

For people who deal with these health challenges, signs of depression and other changes in mental health can manifest in behaviors, which means a user’s devices — “precision technology” like smartphones and smartwatches, and other sensing IoT [Internet of Things] gadgets — can accurately and continuously monitor these shifts.