Where a therapist works on past-based issues or traumas, life coaches focus on the present and design a life of fulfillment into the future. Life coaches are not psychologists or psychotherapists.
If you start life coaching, and have not resolved an issue from the past, then it is very likely you will be referred to work with a therapist to resolve the issue. It is very common for unresolved traumas or addictions to stop us from getting what we want in our lives.
Life coaches help people move forward and set personal and professional goals that will give them the life and career they really want. Most coaching clients are healthy, successful people who might be a bit stuck or simply want to make a big change in their lives and want the support of a coach to do so.