What is the cause of stress? But first a little story.
Meditation is the practice of putting down our 'baggage'. What is the 'baggage' that causes stress?
It is, very simply, our THINKING about the past and the future and missing the fact that all is well right here right now. THINKING about the past or the future is the root of stress.
THOUGHTS create emotions - emotions like stress cause behaviors like agitation. So to get rid of agitation we must change our thinking.