Preoccupied
To be preoccupied refers to the condition when some thoughts or ideas are mu active in our consciousness or working memory that we are not able to devote the attention which the momentary situation relevant demands, resulting in inappropriate response to the stimulus presented. Human beings can be preoccupied because of a plenty reasons. The reasons can range from mere thoughts about a different situation to a disordered thought pattern where an individual is more or less always preoccupied with thoughts that are not of derivative of true rational or logical sense.
When a person with preoccupied with thoughts, it have been seen that their quality of work or productivity decreases considerably, resulting them in failing certain, personal, occupational and functional areas. This type of severe impairment is something which should not be kept untreated and must be brought into clinical attention, so that proper intervention can be administered.