a psychosomatic illness/disease...

hypochondrická/smyšlená nemoc, (být hypochondr)...

The doctor thinks Leo's symptoms are psychosomatic.(CAED)

The best type of treatment for both psychosomatic complaints and hypochondria is some form of psychotherapy or hypnotherapy. (BNC)

They see innumerable patients who have been told that their symptoms are psychosomatic or `;all in the mind'; by one doctor or another. (BNC) 

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