all in (someone's) head

Translations
всё в (чьей-либо) голове
The doctor said the pain was all in her head.
Доктор сказал, что боль была у неё в голове.
Definitions
A phrase used to indicate that something (such as a problem, feeling, or experience) is imagined or not real, but exists only in someone's mind.
Words
head

noun
голова