Othello Syndrome

Othello syndrome, also called delusional jealousy or morbid jealousy, is a psychiatric condition in which a person holds a fixed, false belief that their spouse or partner is being unfaithful, a belief that persists despite a lack of supporting evidence and often despite direct evidence to the contrary. The English psychiatrists John Todd and Kenneth Dewhurst described and named the syndrome in a 1955 paper, drawing the name from William Shakespeare's tragedy Othello, whose title character is driven to murder his wife by an unfounded conviction of her infidelity. In clinical practice the syndrome is usually treated as a symptom rather than a standalone diagnosis, appearing most often alongside conditions such as chronic alcohol use disorder, dementia, psychotic disorders including schizophrenia, or as a side effect of dopaminergic medications used to treat Parkinson's disease. People experiencing the syndrome frequently engage in intense monitoring behavior toward their partner, including searching belongings, tracking movements, and repeated confrontation, and because the delusion can escalate to controlling or violent behavior, clinicians treat it as a condition carrying meaningful risk to the partner as well as to the affected person themselves. Treatment generally focuses on the underlying condition driving the delusion, together with antipsychotic medication where a psychotic process is present, though the jealous conviction itself can be highly resistant to correction through reasoning or reassurance alone.