I doubt it. I think it is just their personality. I know someone who acts the exact same way. So high strung that I can't believe that they haven't had an aneurysm.
Perhaps so.
In my case, hasn't seemed to be a hazard at all. My writing is probably a more intense aspect of my intense personality.
I'm intense otherwise in groups; often when teaching; engaging in passionately felt hobbies of pottery and weaving; etc.
Yet, even my intensity and passions . . . how to put it . . . are not USUALLY super spiking off the chart emotionality.
It's more just how my motor runs. I don't think of diesel's as racy high energy. But they are powerful with a lot of torque. I think my intensity is more like that--at least in person.
Most people close to me report me being one of the most gentle etc. people they know.