A sweeping new analysis of more than a century of mortality data in the United States is challenging one of the most widely held beliefs about the current mental health crisis. The problem, researchers say, did not begin with the internet age. It began decades earlier. And it has been quietly worsening ever since.

Drawing on 122 years of national records from 1900 to 2021, scientists assembled what is now considered the most comprehensive long-term dataset on suicide trends. The effort, led by Dr Nina de Lacy and the REDUCE workgroup, required stitching together fragmented federal archives into a single system known as STACK. It took years of data cleaning, verification, and cross-checking before patterns began to emerge.

“This is one of the first times we’ve been able to step back and see suicide clearly in a long-term historical context,” de Lacy says. “What we found challenges the idea that today’s suicide crisis is purely recent or driven only by individual mental health factors.”

What the team found is both unusual and deeply concerning. Unlike most major causes of death, suicide does not steadily decline with better treatment or awareness. Instead, it moves in cycles—rising and falling roughly every 10 to 25 years. Peaks often align with periods of social strain, including early industrial expansion in the 1910s, the economic collapse of the 1930s, and major cultural shifts in the 1970s.

“Very few causes of death behave like this,” de Lacy says. “Heart disease, cancer, and motor vehicle deaths generally decline when effective interventions are introduced. Suicide doesn’t follow that pattern.”

But beneath these long cycles lies a more troubling pattern. The risk among young people has been climbing steadily for more than half a century. The shift began quietly in the late 1950s. It has not reversed since.

“What we’re seeing is not a short-term spike but a generational shift,” de Lacy said. “Each successive generation has faced higher suicide risk at a younger age than the one before it.”

In simple terms, this means today’s children are encountering risk earlier than their parents did, who in turn faced it earlier than their parents. The burden is moving down the age ladder. Historically, suicide was more common among older adults. That gap has narrowed sharply as rates declined in older groups but rose among those under 35.

Today, suicide ranks among the leading causes of death for people aged 10 to 34 in the United States. Researchers say the trend cannot be explained by biology alone. Instead, it reflects broader social forces—economic uncertainty, isolation, and shifting community structures—that build slowly over time, contributing to the increased vulnerability of young individuals to mental health crises and suicidal behaviour.

The study also highlights stark differences in where and how deaths occur. Since the 1980s, large cities have shown relatively lower suicide rates compared to rural and smaller urban areas. Yet recent increases have been particularly sharp among women in these less urban regions. At the same time, deaths by hanging have risen significantly, forming what researchers describe as a “hidden epidemic” that receives far less attention than firearm-related deaths.

There is also a striking estimate buried in the data. If the country had maintained its lowest recorded age-specific suicide rates over recent decades, more than 372,000 lives could have been saved between 1969 and 2021.

Experts say the findings carry a clear message. Suicide is not only an individual mental health issue. It is also shaped by the world people live in.

That has implications for prevention. Clinical care alone may not be enough. Researchers argue for wider strategies that strengthen social connection, economic stability, and community support—factors that influence entire generations, often long before a crisis becomes visible, such as mental health issues or socioeconomic disparities that can lead to larger societal problems.

The pattern is slow. But it is persistent. And for many families, it is becoming impossible to ignore.