Chakras are centers of electromagnetic activity in the body, through which your life energies find expression. Using the chakras to describe energy flow stems from Eastern traditions.
Each center corresponds with the location of large bundles of nerve fibers in the body. The amount of energy that moves through these different regions of the body makes the chakras feel expansive or restricted.
Different sensations are thus associated with the activation of different chakras. The chakras constitute one holistic system, it is thus misleading to speak of higher and lower chakras, as this seems to imply ‘better’ and ‘worse’.