Can complaining ruin a relationship?

Frequent complaining can lead to heart disease and diabetes. But the more immediate effect is complaining's ability to erode an otherwise healthy relationship, said Gwendolyn Seidman, associate professor of psychology at Albright College in Reading, Penn.

How does complaining affect others?

When you repeat a behavior, such as complaining, your neurons branch out to each other to ease the flow of information. ... Complaining becomes your default behavior, which changes how people perceive you. And here's the kicker: complaining damages other areas of your brain as well.