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10. Shaking
Shaking is commonly associated with stress and excess levels of cortisol. The reason for this is that an increase in one type of neurotransmitter will inevitably have knock-on effects throughout the brain.
Increase cortisol, and you increase one of the primary excitatory neurotransmitters – a chemical responsible for increasing the activity levels in the brain.
When you increase activity in the brain though, the body will wake up and take notice. Spotting all of this increased activity, it will then assume that something very important is happening that demands its attention. That, in turn, causes the release of other excitatory neurotransmitters to further increase your focus and attention. Those include the likes of norepinephrine/adrenaline – the fight or flight hormones.
With more of these chemicals being produced, the body them ramps up its stress response which can result in all kinds of things – including tension in the muscles and a shaking of the hands.