Derealisation: Why the World Can Feel Unreal

The experience of derealisation is difficult to describe and difficult for others to understand. Sufferers typically report that the world looks the same as always but feels completely different — as though the familiar has become strange, or as though they are living inside a film rather than real life. Landmarks they have known for years seem unfamiliar. Their own home feels slightly wrong. Social situations feel performed rather than genuine.

Derealisation may be constant, or it may fluctuate — increasing during periods of high anxiety and receding during calmer periods. It may be accompanied by depersonalisation (feeling detached from oneself), which often occurs alongside derealisation in the context of anxiety.

Derealisation is produced by a specific neurological state that occurs during extreme or chronic anxiety. When the amygdala is in a state of sustained hyperactivation, the brain can enter a dissociative mode in which the intensity of perceptual experience is dampened — a protective mechanism that prevents emotional overwhelm.

At the neurological level, derealisation is associated with altered activity in the prefrontal cortex and altered processing of sensory information from the external world. These are functional changes — not structural damage — and they reverse as the anxiety state that produced them resolves. There is no evidence that derealisation causes any lasting neurological harm.

One of the most frightening aspects of derealisation is the thought it provokes: 'Am I going mad?' This fear is understandable — the experience of reality feeling unreal is profoundly disorienting. But derealisation is not a symptom of psychosis. People experiencing psychosis typically do not question whether their perceptions are real; they believe them to be real. People experiencing derealisation know that their perception is distorted — that's why it is frightening.

Derealisation is also not a sign of brain disease. It does not indicate a tumour, a neurological condition, or any structural abnormality. It is a functional state produced by anxiety, and it is reversible.

Derealisation may occur alongside anxiety, but it is important not to assume the cause without assessment. A healthcare professional can help explore possible contributing factors and discuss suitable support. Seek medical advice if the experience is new, persistent, worsening or accompanied by other concerning symptoms.