What is a psychosomatic illness?

As a member of the psychosomatic association, I am very interested in the roll of the mind in the body. When someone says something is psychosomatic, we mean that the illness is affected by states of mind. We do not mean that it is “invented” or “made up”. It is not a performance. It is a response of the body to something that is not being processed in the mind.
We can often find a psychological remedy to serious skin problems, for instance. There are many conditions with a psychosomatic element.