The phrase "personality changes" refers to shifts or alterations in a person's behavior, attitudes, and characteristics. It means that someone's usual way of thinking, feeling, and acting may be different from before. Full definition
According to recent research, however, it may be the treatment of depression that actually causes personality changes in people with the disorder. (scientificamerican.com)
When you visit any dog at a shelter, be prepared for any degree of personality change from what you saw at the shelter within your first few weeks at home together. (notinthedoghouse.com)
Male cats go through a significant personality change when they mature. (speedwayvet.com)