How to Say "nauseous" in Spanish
The Spanish word for “nauseous” is “mareado” — A2 level. This is a very common word in everyday Spanish.

Examples
Me siento un poco mareado después de girar tanto.
I feel a bit dizzy after spinning so much.
Ella siempre se pone mareada cuando viaja en la parte de atrás del coche.
She always gets motion sick when she travels in the back of the car.
Bebió solo una copa de vino y ya está un poco mareado.
He only drank one glass of wine and he's already a bit tipsy.
Use with 'Estar' not 'Ser'
Since feeling dizzy is a temporary state or feeling, you must use the verb 'estar'. Saying 'soy mareado' would sound like being dizzy is a permanent personality trait!
Matching the Person
The word changes its ending based on who is feeling it. Use 'mareado' for a man and 'mareada' for a woman.
The 'Sick' Confusion
Mistake: “Using 'mareado' for a general illness like a cold.”
Correction: Use 'enfermo' for being sick with a cold/flu. Use 'mareado' specifically for that spinning head or upset stomach feeling.
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