Organic Causes of Psychiatric Disease: Identifying the Exception

The question asks to identify which option is NOT a typical indicator of an organic cause for a psychiatric disease. Organic causes refer to physical or biological factors affecting the brain, distinguishing them from psychological or purely genetic factors.

Evaluating Potential Indicators

• Late age of onset: When a psychiatric illness first appears late in life, it can suggest an underlying physical process (like neurodegeneration or a tumor) rather than a lifelong genetic or developmental issue. This can be a pointer to an organic cause.
• No previous history of psychiatric illness: A sudden onset of symptoms without any prior mental health issues might suggest an acquired condition, potentially due to a physical change in the brain. This also acts as a pointer towards an organic cause.
• No apparent psychological precipitant: If the illness emerges without obvious emotional triggers (like stress or trauma), it often leads clinicians to consider biological or organic causes.
• Family history of psychiatric illness: A significant family history strongly suggests a genetic predisposition or inherited vulnerability. While genetics are biological, this factor is typically considered a non-organic or constitutional cause, distinct from an acquired organic cause. It points towards inherited risk rather than a specific physical brain abnormality.

Key Distinction

A family history primarily highlights genetic influences. In contrast, the other options (late onset, lack of prior history, no clear psychological trigger) are more commonly associated with conditions arising from specific, often acquired, physical changes in the brain, hence pointing towards an organic etiology.

Therefore, Family history of psychiatric illness is the factor that least represents a pointer towards an exclusively organic cause.