We have seven energy centers (chakras) that form an energy current running from the top of our heads to the base of our spines.
When we are healthy and energy is moving freely, each chakra will have a normal/ideal frequency. When different parts of our body become stressed or ill, the frequencies are altered (or blocked), thus no longer optimal or healthy. Blocked energy and the irregular energy flow resulting from it, can manifest as various illnesses (physical, mental or emotional). It's important to keep our energy flowing freely. Crystals are natural way to correct your frequency, or “raise your vibration”.