The human body is made up of a 7 major energy centers called Chakras. When any of these centers is disrupted or damaged by your emotions it causes energy blocks, leaks, improper flow or buildup of energy. Over a prolonged period of time these disruptions cause physical, mental and emotional problems. The chart above shows the major emotional energy centers and the emotional states which disrupt them.
These are some great articles with in-depth information on this subject: