Drug overdoses and other self-poisonings were the most common method among girls and boys, followed by intentional cutting with sharp objects. Nearly 29,000 girls with self-inflicted injuries and about 14,000 boys were treated in emergency rooms in the U.S. during 2001-2015. Some researches say the rise in self-harm and suicide among teenagers could be because those born after 1995 are more prone to mental-health issues than millennials. The most likely reason for this, they say, is the rise of the smartphone, Smartphones crossed the 50 percent threshold of ownership in late 2012, around the same time when teen depression and suicide began to rise.
Because the years between 2010 and 2015 were a period of steady economic growth, it’s unlikely the economy or income inequality is a contributor. Jean Twenge, a psychology professor at San Diego State University found in a research that teens who spend five or more hours a day online were 71 percent more likely to have a least one suicide risk factor, such as depression or making a suicide plan, than teens who spent only one hour a day online.