The fourth chakra, Anahata, the most important chakra of the body, is in the form of a hexagram of a grey-green colour surrounded by 12 vermilion petals with a golden bijakshara.
It represents ailment associated with sense of touch and sense organ skin. Associated with cardiac plexus it controls functions of heart, lungs, thymus and blood circulation. Congestion in Anahata chakra causes heart problem and related diseases. Excess of pranic energy in this chakra causes heart attack. In this case the inner aura may extend up from 6" to 3 feet. Asthma is another example of the hypofunction of this chakra.
Within Anahata chakra is an eight petaled lotus in the center of which rests the spiritual heart or anand kanda on the right side very closely related with the physical heart on the left. An increase or decrease in the rate of heart beat serves as a warning signal that there is some abnormality in the anand kanda.
The fourth chakra has a lingam also known as banalingam. This lingam radiates golden light and is formed from a mass of tissue in the nerve center at the Anahata chakra clearly visible in kirlian photography. "
