Reiki works by inducing the relaxation response.
Reiki switches the body from the sympathetic nervous system to the parasympathetic nervous system.
When we are operating from the sympathetic nervous system we are in fight-or-flight-or-freeze mode, and our body may be flooded with hormones like adrenaline, noradrenaline, cortisol and histamine. We may feel stressed and overwhelmed when we are in this state.
When we switch to the parasympathetic nervous system we are in rest-repair-digest mode. Our body may be flooded with hormones like seratonin and oxytocin. We sleep better, we digest our food better, and our immune system functions more effectively when we are in this state. We feel more peaceful and relaxed, and our body begins to heal.
On an energetic level, Reiki works by flooding your body with healing energy.
This healing energy moves through all levels of your being, bringing balance to your spiritual body, your astral body, your etheric body, your mental body, your emotional body, and your physical body. Chakras are cleared and cleansed. Negative energy is cleared away. Auric injuries are healed. The vibration of energy of the body is raised. Any areas that are low life force energy are replenished and recharged. The energy pathways of the body, sometimes called meridians or nadis, are healed and straightened allowing life force energy to flow easily and freely to every part of your Being.