It is said that when the heart chakra is balanced, one is able to give and receive love openly and freely. This chakra corresponds to the healing energy of love and is the center of compassion. Because it is seen as a unifying chakra, an open heart chakra allows one to feel connected with the universe as a whole.
However, if the heart chakra is out of balance, it is thought to cause high blood pressure, immune system issues and physical problems with the heart -- even cancers of the heart and breast.
Yoga poses which are believed to help stimulate and activate the heart chakra include backbends, such as upward-facing dog pose (urdhva mukha svanasana) and camel pose (ustrasana).