US suicides undercounted as overdoses blur death data, experts warn
Researchers say overdose misclassification may be hiding suicide deaths and weakening public health responses in the United States.
By Priya Raghavan · Science Reporter
3 min read
US suicides undercounted in official death data may be masking the scale of the country’s suicide crisis, according to experts writing in the journal Injury Prevention. The concern centers on drug poisoning deaths, where determining whether an overdose was intentional can be difficult for medical examiners and coroners.
The commentary says the national suicide rate in 2024 was 37.5% higher than in 2000. Over the same span, deaths from opioid and other drug poisoning rose more than threefold, while the recorded suicide rate from drug poisoning moved only from 1.3 to 1.8 deaths per 100,000 people.
Ian Rockett, an injury epidemiologist and adjunct professor of psychiatry at University of Rochester Medicine, argued in a lead essay that many overdose deaths may be assigned the wrong manner of death. Rockett estimates that as many as 30% of overdose deaths listed as accidental or as having undetermined intent could actually be suicides.
Why are US suicides undercounted?
Suicide deaths can be underreported when investigators cannot prove intent after a death. Drug poisoning cases are especially hard to classify because evidence such as a suicide note, psychiatric history or prior attempt may be absent, the commentary says.
Rockett and other contributors said suicides involving firearms or hanging are often more apparent than deaths involving drugs. In overdose cases, medical examiners and coroners may be working with limited staffing, uneven training and incomplete evidence, making “accident” a common finding when intent cannot be established.
Eric Caine, professor emeritus of psychiatry at University of Rochester Medicine and a co-founder and former director of its Center for the Study and Prevention of Suicide, said many overdose deaths do not fit the everyday meaning of accidents. He described repeated illicit drug use, particularly when substances come from unknown sources, as a form of self-injury from a public health perspective.
What is self-injury mortality?
Rockett proposes wider use of a measure called self-injury mortality, or SIM. The measure combines registered suicides with most deaths caused by self-intoxication with drugs, shifting attention from proving a person’s final intent to recording the behavior that led to death.
The commentary says a SIM checkbox on death certificates could help separate random accidents from voluntary behaviors such as using illicit drugs. Caine said such a change could give public health officials a clearer view of the behavior involved without making intent the central issue.
Steven Stack of Wayne State University and Kurt Nolte of the University of New Mexico School of Medicine, who also contributed to the commentary, supported SIM as a broader measure that could expose suicide deaths missed by current reporting systems.
Why better death data matters
The authors said suicide has long been vulnerable to undercounting because of stigma and because medical examiner and coroner offices often lack enough expertise and resources. Rockett argued that the problem has worsened as the opioid crisis, rising suicide rates and the COVID-19 pandemic placed more strain on death investigation systems.
Caine said public health work depends on knowing how large a problem is before designing prevention efforts and judging whether they work. If deaths are misclassified, he said, officials have a weaker basis for measuring the burden of suicide and evaluating interventions.
The commentary, titled “Deterioration of American suicide accounting as rates rise during the 21st century and responses by suicidologists with respective expertise in psychiatry, sociology and forensic pathology,” was published in Injury Prevention.
This story draws on original reporting from Medical Xpress.