Mindfulness is knowing what is happening while it is happening. It is not only a state of mind it is a state of being.
Mindfulness in the West has developed out of both stress reduction programmes and psychological developments in helping people with recurrent depression.
Mindfulness-based Cognitive Therapy has been developed with the aim of reducing relapse and recurrence for those who are vulnerable to episodes of depression. You can read more by clicking here.
The Centre for Mindfulness Research and Practice at Bangor University has also published some useful information about Mindfulness and how it can help. If you click here you can take a look.