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(WZZM) - No matter how frustrated they make you, try not to yell at your teenager.

A new study shows when parents disciplined their teenagers by yelling, swearing at them or humiliating them two or more times a week, the child is more likely to act up in school.

They are also more likely to lie to parents, fight or show signs of depression.

"When their primary caretakers are yelling or humiliating them, it really causes them to question their own self worth and their own identity," said Mark Crawford, a clinical psychologist. "You have to self soothe, you have to step away, get control of your own emotions. Then decide what am I trying to do? Do I need to discipline, to teach or do I need to just have a conversation with them?"

Psychologists say parents usually yell because they take their child's behavior personally or they feel out of control.