Have you ever had a friend or a family member, who manages to find a way to talk about themselves, always, even when the topic isn’t about them or you’re going to them to vent or talk about a problem?

The National Institute of Health calls this behavior “Conversational Self-Focus,” and it’s when someone has the tendency to redirect conversations toward themselves and away from others.

Clinical and family psychologist, Dr. Jennifer Hartstein of Hartstein Psychological Services, joins NBC News Now’s Mental Health Check to explain why people do this and whether they even realize they are doing it or not.

Watch now to learn more.