All teenagers will act up or misbehave at some point or another. Rebellion and testing boundaries can be a normal part of maturing and reaching adulthood. In some cases though, rebellion and disruptive behavior can signal a problem that stretches beyond the usual teenage antics. Up to 16 percent of all teenagers have conduct disorder, a type of mental illness, according to WebMD. Teenagers with conduct disorder exhibit extremely aggressive behavior that puts themselves and others at risk.
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