Why Ruminating is Unhealthy and How to Stop: By MARGARITA TARTAKOVSKY, M.S. ~ Why Ruminating is Unhealthy and How to StopRuminating is like a record that’s stuck and keeps repeating the same lyrics. It’s replaying an argument with a friend in your mind. It’s retracing past mistakes. When people ruminate, they over-think or obsess about situations or life events, such as work or relationships.