every emotional pain that you experience leaves behind a residue of pain that lives on in you. It merges with the pain from the past, which was already there, and becomes lodged in your mind and body. This, of course, includes the pain you suffered as a child, caused by the unconsciousness of the world into which you were born. This accumulated pain is a negative energy field that occupies your body and mind. If you look on it as an invisible entity in its own right, you are getting quite close to the truth. It's the emotional pain-body. It has two modes of being: dormant and active. A pain-body may be dormant 90 percent of the time; in a deeply unhappy person, though, it may be active up to 100 percent of the time. Some people live almost entirely through their pain-body, while others may experience it only in certain situations, such as intimate relationships, or situations linked with past loss or abandonment, physical or emotional hurt, and so on.
— Eckhart Tolle