Sudden fright. Startling. As children we are more vulnerable to things that startle and frighten us suddenly.

Shock stops bodily activity for a moment and then resumes it at an accelerated pace. "Like a lurch in the heart". Then it causes palpitations, difficulty breathing and insomnia. It mainly affects the Heart Qi and Blood. It disturbs the Qi. It also affects the Kidneys because they have to supply with their stored Essence the energy that has been dispersed.