The suicide rate in the United States increased 33% between 1999 and 2017, the Centers for Disease Control and Prevention reported Thursday — the latest in a troubling trend of reports showing more men and women, in nearly all states and across various racial and ethnic groups, dying by suicide. Experts say it’s a public health crisis.

In 1999, about 10.5 suicides occurred per 100,000 people, the CDC report said. In 2017, the rate was 14 per 100,000. The sharpest increases have been among adolescents and young adults. The only decrease in the suicide rate was seen among people over 75.

Among young adults, both men and women, the rate of suicide was highest among American Indians or Alaskan Natives. But among middle-aged individuals, the rate was highest for white men and women.

Researchers from Harvard Medical School and Tel Aviv University took a closer look at suicides among adolescents and young adults, groups in which suicide is the second leading cause of death.

In a report published Tuesday, they found there were 6,252 suicides of people aged 15 to 24 in 2017 — the highest number since 2000.

The majority were males, which fits a well-established trend that women attempt suicide more often than men, but men die more often from it. Researchers believe this has to do with the means used. Men more often use guns, which are more likely to result in death. Women often use pills — a trend that has more than doubled in the last decade.

Particularly concerning, both groups of researchers noted, is that this data might underestimate the problem. Causes of death on death certificates can be wrong; for example, if a suicide using opioids is mistaken for an accidental overdose.

Suicide is a complex topic, and any individual death is typically driven by a number of factors. But researchers have suggested several potential drivers behind the recent increase.

Among adolescents and young adults, researchers point to the growing use of social media and the proliferation of smartphones, which may increase cyberbullying and lead to feelings of loneliness, but research on the topic is still divided.

For middle-aged white adults, researchers have suggested the increasing suicide rate may be linked to a loss of blue-collar jobs, especially in rural or low-income areas, and concerns that they will not be financially better off than their parents.

Although there’s no one solution, suicide is preventable, experts say, and requires a public health approach.

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