There are often times when a current life problem has its origins in a past life experience and it is necessary to follow the root on, out of this life and into another in order to heal it. It is possible when working with the inner part of a client that it is actually a past life part of the client that has been reached and the healing and integration requires the client to have the past life information brought to the conscious mind at this time.
It may be that something needs to be brought through to understand yourself, a current life situation, to make sense of patterns of behaviours or to understand your relationships. It can be that a very specific and deep soul trauma is ready to be healed and integrated. It may be the need to look at the karma in your current life and clear past vows and contracts.
It in some cases it can be an opportunity brought forward for ancestral healing if you were the original ancestor to experience the trauma. There can be many reasons why you need to visit a past life but it is always when the time is right and a deeper understanding of yourself is needed.