For example, they're more than twice as likely as others to consider suicide.
Boys who have faced dating violence are nearly four times as likely to have been bullied online; girls are more than twice as likely.
Boys and girls who have been victims of dating violence are more likely to get into fights, carry a weapon, use alcohol, use marijuana or cocaine and have sex with multiple partners the study says.
Researchers don't know if any of these events causes the others, however.
Meanwhile, victims of relationship abuse share many traits as well, including: physical signs of injury, missing time at work or school, slipping performance at work or school, changes in mood or personality, increased use of drugs or alcohol, and increasing isolation from friends and family.
Teens are sometimes more willing to talk to doctors, especially if their parents are not in the room.
Pediatrician Claire Mc Carthy says she talks about healthy relationships with her adolescent patients and asks if sex is consensual, but she says it is hard for doctors to find time to delve into such intimate issues, given that most pediatric appointments last only 15 minutes.
Twenty-one percent of high school girls have been physically or sexually assaulted by someone they dated -- a figure twice as high as previously estimated, a new study shows.
Ten percent of high school boys also report having been physically or sexually assaulted by a dating partner, about the same rate reported in earlier surveys, according to a study led by the Centers for Disease Control and Prevention published today in JAMA Pediatrics.