Normally when we are taking major decisions all of us feels confused but leading a life full of confusion is a disorder. Confusion is a state of mind we are unable to choose what is right.
When the brain gets less oxygen supply we tend to live in a confusion. Brain needs 20% of oxygen of the body. When you have lung disease, heart disease or artery blockages you get less oxygen to brain and that leads to confusion.
When you want to make a decision or when you are in a confused state. Take couple of deep breath, walk in a open air place your mind will be clear with in few minutes.