Stroke causes
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Major Types and Vascular Causes of Stroke
Stroke is a sudden neurological event caused by vascular injury to the brain, most commonly due to either a blockage (ischemic stroke) or bleeding (hemorrhagic stroke) in the brain's blood vessels. About 85% of strokes are ischemic, typically resulting from small vessel disease (arteriolosclerosis), large artery athero-thromboembolism, or cardioembolism. The remaining 15% are hemorrhagic, often caused by deep perforator (hypertensive) arteriopathy or cerebral amyloid angiopathy, with some cases linked to macrovascular lesions like aneurysms or vascular malformations, especially in younger patients. Hypertension is the most significant modifiable risk factor for both types of stroke, but its impact varies by stroke subtype 178.
Modifiable and Non-Modifiable Stroke Risk Factors
Stroke risk factors are divided into modifiable and non-modifiable categories. Modifiable risk factors include hypertension, smoking, poor diet, physical inactivity, obesity, diabetes, and heart disease. Non-modifiable risk factors include age, sex, and race/ethnicity. Lifestyle changes and management of medical conditions such as hypertension and diabetes are key strategies for reducing stroke risk. Recent research also highlights the role of inflammation, pollution, and certain cardiac disorders in increasing stroke risk 5109.
Genetic and Heritable Causes of Stroke
While most strokes are due to environmental and lifestyle factors, about 1% to 5% are linked to single-gene (monogenic) disorders. The most common genetic causes include CADASIL, Fabry disease, MELAS, COL4A1 syndrome, CARASIL, and HERNS. These genetic conditions often affect small blood vessels in the brain and can be the primary or only manifestation of a broader syndrome. Identifying these rare causes is important for appropriate management and family counseling 365.
Infectious Causes of Stroke
Infections, though less common, can directly cause stroke. Bacterial infections, especially infective endocarditis, are notable contributors. Viral infections like varicella zoster virus (VZV) are recognized causes in both children and adults. Fungal infections such as Cryptococcus and Candida are more common in immunocompromised individuals. COVID-19 has also been associated with an increased risk of ischemic stroke. Infections can trigger stroke through mechanisms like inflammation, vasculitis, and accelerated atherosclerosis, and should be considered especially in young or immunocompromised patients and those with strokes of unknown origin 245.
Unique Causes of Stroke in Young Adults
Stroke in young adults is rising, partly due to increased prevalence of traditional risk factors like hypertension, obesity, and diabetes. However, unique causes in this group include cervical artery dissection, cardioembolic events, vasculitis, connective tissue diseases, patent foramen ovale, and cerebral venous thrombosis. Non-modifiable factors such as migraine, pregnancy, illicit drug use, oral contraceptives, and hypercoagulable states also play a role 916.
Conclusion
Stroke is a complex condition with multiple causes, including vascular injury, modifiable lifestyle factors, genetic disorders, infections, and unique mechanisms in younger individuals. Understanding these diverse causes is essential for effective prevention, diagnosis, and management of stroke across different populations 1578.
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Most relevant research papers on this topic
Stroke: causes and clinical features
Stroke is a leading cause of death and disability, with hypertension being the most important modifiable risk factor, and understanding its causes and mechanisms is crucial for effective management and prevention.
Infectious Causes of Stroke.
Bacterial agents, VZV, and COVID-19 are the most common infectious agents causing stroke, with ischemic strokes being more common in COVID-19 patients.
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