COLD OR SCARED?
Have you ever felt nervous and begun to shiver, even though it isn’t cold and you aren’t unwell? This is because increases in adrenaline can cause shivering. When you feel anxious or scared, part of the brain called the amygdala releases the fight-or-flight hormone adrenaline. This causes contractions in the muscles by increasing their energy levels in preparation for a physical fight or to move away from danger. As adrenaline levels increase, muscles can shake uncontrollably. Usually this is because the built-up extra energy wasn’t required by the muscles.