When someone rejects a diagnosis of mental illness, it’s tempting to say that he’s “in denial.” But someone with acute mental illness may not be thinking clearly enough to consciously choose denial. They may instead be experiencing “lack of insight” or “lack of awareness.” The formal medical term for this medical condition is anosognosia, from the Greek meaning “to not know a disease.”
When we talk about anosognosia in mental illness, we mean that someone is unaware of their own mental health condition or that they can’t perceive their condition accurately. Anosognosia is a common symptom of certain mental illnesses, perhaps the most difficult to understand for those who have never experienced it.
Anosognosia is relative. Self-awareness can vary over time, allowing a person to acknowledge their illness at times and making such knowledge impossible at other times. When insight shifts back and forth over time, we might think people are denying their condition out of fear or stubbornness, but variations in awareness are typical of anosognosia.
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