Does Sitting Cause Sciatica?

We're asked all the time does sitting too long cause sciatica and lower back pain. In this video let me demonstrate the effect of sitting on your spine.
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[@johnluvsluna]

I spend 10 - 11 hour shifts in an office chair with few or many times no breaks.
I admit I have poor posture and slouch with my pelvis moving forward in the seat, especially later on in the long shift.
I notice stffness when I get up and now when I walk I have shooting mild pain in my left glut and down my left thigh. The glut pain feels deep and around where the bone attaches to the muscle.
Could this be early sciatica or a hamstring injury from prolonged sitting?