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

Examples
Me preocupa que no haya comido nada hoy.
It worries me that she hasn't eaten anything today.
La crisis económica preocupa a muchas familias.
The economic crisis concerns many families.
Él siempre se preocupa demasiado por el trabajo.
He always worries too much about work.
Gustar-like Structure
When using 'preocupa' to mean 'It worries ME,' the word for 'it' is the subject, and the person worried is indicated by a pronoun like 'me,' 'te,' or 'nos.' (Example: 'Me preocupa la lluvia' - The rain worries me.)
Reflexive Use
To say a person 'worries' themselves, you must use the reflexive form 'preocuparse' and the appropriate pronoun: 'Él se preocupa' (He worries himself).
Using 'Por' Incorrectly
Mistake: “Me preocupa SOBRE el examen.”
Correction: Me preocupa EL examen (The exam worries me). If you use 'preocuparse' (the reflexive form), use 'por': 'Me preocupo POR el examen' (I worry about the exam).
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