Anahata chakra is where the Atman, or true Self, resides. Realizing this Self is only possible if one is unconditional in love, which can be achieved when the anahata chakra is balanced. A balanced anahata chakra promotes love, compassion, forgiveness and Self-realization. If this chakra is unbalanced, it can cause possessiveness, emotional instability and health conditions such as heart disorders and lower immunity levels.
Anahata chakra is also the seat of anahata nada, which yogis hear during deep meditation. Anahata nada is the sound that is not made and cannot be heard unless one achieves the highest level of meditation.