neurosis noun

/njʊəˈrəʊ.sɪs/

/nʊrˈoʊ-/ n [C or U] (plural neuroses)

Definition

a mental illness resulting in high levels of anxiety, unreasonable fears and behaviour and, often, a need to repeat actions unnecessarily

If you want my opinion, I think she's suffering from some form of neurosis.

She's obsessively clean - it's almost become a neurosis with her.

(Definition of neurosis noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Synonyms and related words:

to worry

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