Como dizer "mudanças de humor" em inglês

Mood swings
Mood shifts:
Sudden big changes in someone's mood.

Ms Hudson said the suicide risk was a "reflection of the extreme mood swings". - bbc

This is a chronic condition that affects women more than men and that is characterized by rapid mood shifts between excitement/happiness and anger/irritability/sadness. These shifts typically occur numerous times over the course of a day. But most people with borderline personality disorder do not have clear manic episodes, although depression is very common.

Ref. CNN