Stroke nearly doubled in young adults, while falling in older ones

Clinical takeaway: Screen and treat vascular risk factors aggressively even in young adults, including hypertension, diabetes, and atrial fibrillation, and ask specifically about substance use. 

Stroke still carries the reputation of an older person's disease, and clinical suspicion tends to follow that rule of thumb. But that presumption is eroding as patients with strokes have been getting younger. For years, US stroke mortality data have hinted at trouble in young adults. But mortality is a blunt measure. 

What was missing was contemporary, population-level data separating more strokes from deadlier ones. A new study addresses that separation directly, tracking both how often strokes occurred and how often they killed across nearly three decades in a US population built to mirror the country. 

First-ever strokes among adults ages 20 to 54 nearly doubled from 33.9 to 62.2 cases per 100,000 person-years, while rates among adults 55 and older fell by more than one-quarter to 453.0. Stroke incidence increased across both younger (20-37 years) and older (38-54 years) subgroups within the 20-54 age range.

Ischemic stroke accounted for essentially all of the rise; hemorrhagic stroke rates held flat. Cardioembolic stroke was the only ischemic mechanism to increase over the period. Atrial fibrillation more than quadrupled alongside it, though it remained uncommon. 

By 2020, three in five young stroke patients had hypertension, one in four had diabetes, and two in five used substances. Most of the latter was cannabis. Substance use stood at about one in 20 when the study began. Despite these increases in risk factors, 30-day case fatality declined from 11.7% to 9.4% after adjustment for age, race, and sex. The improvement was concentrated in intracerebral hemorrhage. Case fatality in older adults did not change.

The findings come from the Greater Cincinnati/Northern Kentucky Stroke Study, a long-running population-based study of a five-county region whose 1.4 million residents are representative of the US population by age, share of Black residents, education, and income. Stroke-trained physicians adjudicated 2,076 first-ever strokes in adults ages 20 to 54 across six study periods between mid-1993 and 2020, with case definitions held constant throughout. 

The two trends compound rather than offset: more young adults are having strokes, and more are surviving them, which the authors say will mean a growing population living for decades with stroke-related disability. A stroke at 40 costs more working years than one at 75, and the patients accumulating now will carry that burden through every clinic that cares for them. 

"Our findings highlight the importance of identifying and managing stroke risk factors early in adulthood," said study author Emily R. Fisher, MD, of the University of Cincinnati. "Additional research is needed to better understand what is driving these trends and how they can be reversed." 

Source: Fisher ER, et al. (2026 Sep 23) Neurology. Stroke in the Young: Incidence, 30-Day Case Fatality Rates, and Risk Factors Over Time in a Population-Based Study