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100% posture. I had the exact same problem until I started going for long walks and fixed all the mis-aligned muscles, tendons & ligaments.
Do some activities that require you to be vertical and stop slouching while you drive, work, eat, etc.
A few years of laptop life fucked my neck & back up so bad I had to visit a Chiro a few times to un-pinch nerves.
edit: Oh and regarding nut cancer, not likely imo but it can have an affect on your fertility.
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