How to Say "delirium" in Spanish
The Spanish word for “delirium” is “delirio” — B2 level.

Examples
La fiebre alta le provocó un estado de delirio.
The high fever caused him to enter a state of delirium.
En su delirio, el paciente creía que estaba en su casa.
In his delirium, the patient believed he was at home.
Sufre de un delirio de persecución y cree que lo siguen.
He suffers from a delusion of persecution and thinks he's being followed.
It's a Masculine Noun
Always use 'el' or 'un' with this word. For example: 'el delirio' or 'un delirio'.
Abstract Concept
This word usually refers to the state of mind rather than a single specific thought, though it can be used for both.
Confusion with 'Delirious'
Mistake: “Estoy delirio.”
Correction: Estoy delirando (I am raving) or 'Tengo delirio' (I have delirium). 'Delirio' is the thing, not the description of the person.
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