This is a very important subject in Tibetan Medicine. As mentioned in the rGyud-bzhi text, the root cause of all our suffering is ignorance. An ignorant mind cannot view true phenomena and falls into illusion. A mind with illusions causes misunderstanding, misperception and is easily misled. The main cause for illusions is a lack of awareness and closed-mindedness. An unaware mind disturbs the nervous system, mental consciousness and the brain, which can influence the disorder. Thus the practice of mindfulness can help to clarify illusions, misconceptions and ignorance.