They have internal and external energy control and communication functions. Their health is in correspondence with our feelings and attitudes.
We possess a central channel, called Sushumna in The Hindu tradition, which crosses the body vertically by encompassing the spine. This channel conveys the force of life, also called Kundalini, or spiritual strength. It is this force that animates the physical body, which makes the difference between a living being and a corpse. It is our connection with heaven and earth, it comes from heaven and earth. The physical body transforms it by a subtle alchemy, then reemits it to the sky, the earth, and the environment.
Two other parallel channels Pingala and Ida are connected to the Sushumna Central channel. They represent the right-left polarity, or masculine-feminine, of the being seven Chakras (main) are implanted along the Sushumna. They have the shape of double cones, whose point of intersection of the two cones is placed in the central channel, and whose openings flare forward and backward.
The Chakras are therefore in constant vital exchange with the Sushumna canal, and through it, with the Nadis. They are centers of transformation and regulation of this energy of life. They receive and emit as much by the Sushumna and the other channels as by their own radiation, all around the body. They act as antennas and centers of communication with the organs of the body, with the Earth, with the sky.
They are the points of intersection of the Nadis, through which the Prana, the Chi or the vital energy circulates.
The chakras accumulate Prana and the energy becomes more and more subtle as it rises from the base of the chakras to the top of the head.
Each chakra has its characteristics and corresponds to a very precise color, element and physical and emotional functions. In addition, each chakra vibrates at a particular frequency.
The influence of the chakras on the health of our physical body is explained by the principle that our astral body, where the chakras are located, vibrates at a higher frequency than our physical, denser body.
The first disorders are translated into the second, causing illnesses.
These dysfunctions can materialize either by shrinking the chakras or by slowing their speed of rotation, which reflects a relative inactivity of the organs, either by enlarging the chakras or by increasing their Speed of rotation, sign of problems both physical and emotional. It is this last phenomenon that is observed on the solar plexus chakra when the adrenals work too much, due to stress.
The seven main chakras correspond to the seven main endocrine glands.
These lessons were taken from the site http://www.aventureceleste.com/leschakras.php
Of course, embellished by other sources and my personal experiences
Frantz Rimpel