A new 30-year analysis reveals major changes in brain health across the United States, showing neurological conditions now affect a vast portion of the population.
The findings come from a sweeping analysis published in JAMA Neurology on April 20, 2026. The research indicates that brain and nervous system conditions are nearly universal, with more than half of all Americans, or about 180 million people, currently living with at least one neurological disease or disorder.
The analysis is based on the Global Burden of Disease 2021 study, one of the largest health datasets. Researchers evaluated U.S. data from 1990 to 2021, looking at 36 conditions affecting the brain, spinal cord, and peripheral nerves. The study measured disability-adjusted life years, a metric that captures years lost to early death and years lived with disability.
They found disorders affecting the nervous system were the leading cause of disability in the United States, accounting for 16.6 million disability-adjusted life years in 2021 alone.
The Most Common Conditions
The most common neurological conditions in the U.S. may be surprising. While many think of Alzheimer’s or Parkinson’s disease, the most prevalent conditions are different. They are tension-type headaches, affecting roughly 122 million Americans; migraine, affecting about 58 million; and diabetic neuropathy, affecting around 17 million.
These conditions often begin earlier in life and may not be life-threatening, but they can disrupt daily functioning, productivity, and quality of life. Meanwhile, the conditions responsible for the greatest overall health loss were stroke, Alzheimer’s disease and other dementias, diabetic neuropathy, and migraine.
Understanding the Rising Numbers
While more Americans are living with neurological conditions than ever before, the data presents a more nuanced story. When researchers adjusted for age, the prevalence of neurological disorders in the U.S. has remained essentially flat over the past 30 years and even declined slightly. This means people are not suddenly more likely to develop these conditions.
The primary driver of the growth is an aging population. Americans are living longer, and many neurological conditions, including stroke, dementia, and neuropathy, are far more common later in life. At the same time, deaths from neurological diseases have dropped by about 15% since 1990, due to better prevention, faster diagnosis, and advances in treatment and emergency care, especially for stroke.
The result is that more people are surviving neurological conditions and living with them for longer. Years lived with disability increased by nearly 10%, highlighting a growing need for better long-term management and support.
Protecting Brain Health
While genetics and aging play a role, research shows brain health is influenced by everyday choices. Factors that protect the heart and metabolism also support the nervous system. These include managing blood sugar and blood pressure to reduce the risk of stroke and diabetic neuropathy, moving the body regularly through aerobic and strength-based exercise, and prioritizing sleep, which supports brain repair.
Eating for brain resilience by emphasizing omega-3s, fiber, antioxidants, and adequate protein is also recommended, as is staying socially and cognitively engaged, which is linked to slower cognitive decline.
The takeaway from the research is that brain health is not a niche concern but something that touches nearly every family in the country. Neurological conditions are common, long-lasting, and deeply connected to how people live, age, and function. The encouraging part is that this burden is not fixed. Many of the biggest drivers of neurological disability are influenced by factors that can be addressed earlier and more consistently.
The broader context of this study aligns with ongoing public health efforts to improve early detection and management of chronic conditions. Increased awareness of neurological health is leading to more research funding and community support programs aimed at improving quality of life for those affected.
