Stroke Prevention: a Comprehensive Review of Risk Factors, Lifestyle Measures, Pharmacological Strategies and Long-Term Care

Stroke is a sudden neurological disorder caused by an interruption of blood supply to part of the brain or by bleeding within the brain. The resulting injury may lead to weakness, speech disturbance, visual impairment, cognitive problems or death. Although stroke is often described as an acute event, the factors that produce it usually develop over many years. For this reason, prevention begins well before the first symptoms appear and continues after a stroke or transient ischemic attack (TIA). [1–4]

Recent global estimates underline the continuing public-health importance of stroke. The World Health Organization reports that stroke was among the leading causes of death and disability globally in 2021, with about 11.9 million new strokes and an estimated 93.8 million people living with stroke. A large share of the burden is linked to modifiable exposures such as high blood pressure, unhealthy diet, tobacco use, high LDL cholesterol, high blood glucose, excess body weight, physical inactivity, kidney dysfunction, air pollution and harmful alcohol use. [1,2]

The encouraging message is that stroke risk is not fixed. Regular screening, healthy behavior and appropriate treatment of vascular risk factors can substantially lower risk. The 2024 American Heart Association/American Stroke Association (AHA/ASA) guideline emphasizes prevention across the life course and places greater attention on healthy behaviors, social determinants of health, sex-specific risks and integrated cardiovascular risk reduction. [3] For people who have already experienced stroke or TIA, secondary prevention is equally important because recurrence risk remains clinically significant. [4,5]

2. Types of Stroke

Stroke is broadly classified into ischemic and hemorrhagic stroke. A TIA is not a completed stroke but is an important warning event and should be treated as an emergency because it identifies a period of increased risk. [1,4]

2.1 Ischemic stroke

Ischemic stroke occurs when a cerebral artery becomes blocked, reducing oxygen and glucose delivery to brain tissue. Common mechanisms include large-artery atherosclerosis, small-vessel disease and cardioembolism, particularly in patients with atrial fibrillation. Other causes include arterial dissection, uncommon vasculopathies, thrombophilic states and strokes of undetermined cause. Prevention is therefore mechanism-specific: antiplatelet therapy is generally used for non-cardioembolic ischemic stroke, whereas anticoagulation is used when a suitable cardioembolic source such as atrial fibrillation is identified. [4,6,7]

2.2 Hemorrhagic stroke

Hemorrhagic stroke results from rupture of a cerebral blood vessel. Intracerebral hemorrhage and subarachnoid hemorrhage are the major forms. Long-standing or severe hypertension is a major modifiable contributor to intracerebral hemorrhage, while aneurysms and vascular malformations are important causes of subarachnoid hemorrhage. Prevention therefore focuses strongly on blood-pressure control, avoidance of unnecessary exposure to bleeding-promoting drugs and identification of structural vascular disorders when clinically indicated. [8,9]

2.3 Transient ischemic attack

TIA produces temporary focal neurological symptoms without persistent infarction detectable by standard tissue-based definitions. A TIA should never be dismissed simply because symptoms resolve. It provides an opportunity to identify the underlying vascular mechanism and rapidly address blood pressure, lipids, diabetes, atrial fibrillation, carotid disease, smoking and other risks. [4,10]

3. Pathophysiological Basis of Stroke Prevention

The vascular processes leading to stroke are interconnected. Hypertension promotes endothelial injury, arterial remodeling and small-vessel damage. Atherosclerosis causes plaque formation and can lead to artery-to-artery embolism or local thrombosis. Dyslipidemia accelerates atherosclerotic plaque development, while diabetes contributes through endothelial dysfunction, inflammation, oxidative stress and accelerated vascular disease. Atrial fibrillation favors formation of thrombi in the atria, which may embolize to cerebral arteries. Smoking increases oxidative stress, platelet activation and vascular injury. [2,7,11]

These mechanisms explain why prevention works best as a combined strategy. Treating only one factor may leave substantial residual risk. For example, a patient with hypertension and atrial fibrillation needs both effective blood-pressure management and appropriate stroke-preventive anticoagulation. Similarly, lipid lowering is more effective when accompanied by smoking cessation, physical activity and dietary improvement. Prevention should therefore be individualized rather than reduced to a single drug or lifestyle recommendation. [3,4,7]

4. Stroke Risk Factors

Stroke risk factors can be divided into non-modifiable and modifiable factors. Age, sex, genetic susceptibility and a previous stroke or TIA cannot be changed, but they help determine the intensity of prevention. Modifiable factors are the main targets for intervention. [1–4]

4.1 Non-modifiable risk factors

Increasing age is strongly associated with stroke because vascular and cardiac disease accumulate over time.

Previous stroke or TIA is a major marker of recurrent risk and requires long-term secondary prevention.

Family history and genetic susceptibility can contribute to vascular risk.

Some sex-specific and reproductive factors influence risk, including hypertensive disorders of pregnancy and premature menopause. [3,4]

4.2 Modifiable risk factors

Hypertension is the most important modifiable risk factor for both ischemic and hemorrhagic stroke. Other major factors include cigarette smoking, dyslipidemia, diabetes mellitus, obesity, physical inactivity, unhealthy diet, atrial fibrillation and other heart disease, excessive alcohol use, kidney disease and certain drug exposures. Air pollution is increasingly recognized as an important population-level contributor. [1–3,11]

Table 1. Major stroke risk factors and prevention approach

5. Screening and Assessment for Stroke Risk

Prevention begins with identifying risk before symptoms occur. A routine cardiovascular assessment should include blood pressure, smoking and tobacco exposure, body weight or waist-related measures, physical activity, dietary pattern, lipid profile, glucose status and relevant medical history. Assessment should also consider atrial fibrillation, sleep disorders, kidney disease, pregnancy-related vascular risk and family history when clinically appropriate. [3,11,12]

For patients with suspected acute stroke, prevention is not a substitute for emergency care. Sudden facial weakness, arm or leg weakness, speech difficulty, vision loss, severe imbalance or a sudden unexplained severe headache should prompt immediate emergency evaluation. Brain imaging with CT or MRI helps distinguish ischemic from hemorrhagic disease, while vascular imaging, cardiac evaluation and laboratory testing may be used to identify the mechanism and guide secondary prevention. [1,5,8]

6. Primary Prevention of Stroke

7. Primary Prevention of Stroke

6.1 Blood pressure control

Blood pressure control is the central component of stroke prevention. Persistent hypertension damages both large and small cerebral vessels and is strongly associated with ischemic stroke and intracerebral hemorrhage. Regular measurement is important because hypertension is often asymptomatic. Treatment combines lifestyle modification with antihypertensive medication when clinically indicated. [1,3,11,12]

11. Lifestyle Modification

6.2 Lipid management

Elevated LDL cholesterol contributes to atherosclerotic disease and therefore increases vascular risk. Diet, physical activity and weight management are useful foundations, but many high-risk patients also require statin therapy. Evidence from the SPARCL trial showed that intensive atorvastatin therapy reduced recurrent stroke and major vascular events in selected patients after recent stroke or TIA. [14,15]

6.3 Diabetes management

Diabetes increases stroke risk through a combination of metabolic, endothelial and inflammatory mechanisms. Prevention requires sustained glycemic management together with attention to blood pressure, lipids, weight, kidney function and cardiovascular risk. The aim is not simply to normalize a single laboratory value; rather, diabetes care should reduce the patient's overall vascular risk. [3,4,16]

6.4 Smoking cessation

Tobacco exposure is a major preventable cause of vascular disease. Smoking promotes endothelial dysfunction, platelet activation and atherosclerosis. Complete cessation is preferable to simply reducing the number of cigarettes. Counseling, behavioral support and pharmacological aids can improve the likelihood of successful quitting. Avoiding second-hand smoke is also desirable. [1–3,17]

6.5 Healthy diet

Diet influences stroke risk through several pathways, particularly blood pressure, lipid levels, body weight and glycemic control. A Mediterranean-style dietary pattern emphasizing vegetables, fruits, whole grains, legumes, nuts, fish and unsaturated fats has supportive evidence for cardiovascular and stroke prevention. Reducing sodium, processed foods, excess saturated fat and added sugars can further support risk reduction. [3,18]

6.6 Physical activity

Regular physical activity improves blood pressure, insulin sensitivity, lipid profile, body composition and cardiorespiratory fitness. For most adults, a practical goal is at least 150 minutes of moderate-intensity aerobic activity per week, or an equivalent combination of moderate and vigorous activity, with gradual progression according to fitness and medical status. Breaking up prolonged sitting and adding muscle-strengthening activities can complement aerobic exercise. [3,19]

6.7 Weight management

Overweight and obesity are linked to stroke through hypertension, diabetes, dyslipidemia, inflammation and sleep-disordered breathing. Sustainable weight management should focus on dietary quality, regular activity, adequate sleep and realistic behavioral goals rather than rapid weight loss. In selected patients with obesity and diabetes or high cardiovascular risk, modern weight-management and glucose-lowering therapies may have a role under medical supervision. [3,16]

6.8 Alcohol and substance use

Harmful alcohol use can increase blood pressure and may contribute to atrial fibrillation and hemorrhagic stroke. Prevention should focus on reducing harmful consumption and recognizing patients who need structured support. Illicit stimulants such as cocaine and amphetamines can also increase vascular and stroke risk and require appropriate counseling and treatment. [1,2,20]

6.9 Sleep and obstructive sleep apnea

Sleep disorders, particularly obstructive sleep apnea, are associated with hypertension and vascular risk. Patients with loud snoring, witnessed apneas, excessive daytime sleepiness or resistant hypertension may benefit from clinical assessment for sleep-disordered breathing. Addressing sleep health is increasingly considered part of comprehensive cardiovascular prevention. [3,21]

6.10 Atrial fibrillation and cardiac disease

10. Stroke Prevention in Atrial Fibrillation

7. Secondary Prevention After Stroke or TIA

8. Secondary Prevention of Stroke

7.1 Antiplatelet therapy

For most patients with non-cardioembolic ischemic stroke or TIA, antiplatelet therapy is a major component of secondary prevention. Aspirin, clopidogrel or aspirin combined with extended-release dipyridamole may be used depending on the clinical situation. Short-term dual antiplatelet therapy can be beneficial after selected minor ischemic strokes or high-risk TIAs, but prolonged dual therapy increases bleeding risk and is not routinely used for long-term prevention. [4,23,24]

7.2 Anticoagulation for atrial fibrillation

When atrial fibrillation is responsible for cardioembolic risk, anticoagulation rather than antiplatelet therapy is generally the preventive strategy, unless contraindicated. Direct oral anticoagulants are commonly preferred for many patients with non-valvular atrial fibrillation, while warfarin remains important in selected situations such as mechanical heart valves. Choice and timing depend on stroke severity, bleeding risk, kidney function, age, interactions and the specific cardiac condition. [4,22,25–27]

7.3 Lipid lowering after stroke

High-intensity statin therapy is widely used in secondary prevention when appropriate. The purpose is not only to lower LDL cholesterol but also to reduce future atherosclerotic vascular events. Treatment intensity and LDL goals should be individualized according to stroke mechanism and overall cardiovascular risk. [4,14,15]

7.4 Blood pressure after stroke

Once the acute phase is over and the patient is clinically stable, long-term blood-pressure reduction is a central element of secondary prevention. A commonly recommended target for many patients is below 130/80 mmHg, although the target should be adapted when orthostatic symptoms, frailty or other conditions make aggressive lowering unsafe. [4,10,12]

7.5 Carotid and vascular disease

Patients with non-cardioembolic ischemic stroke or TIA should be assessed for relevant extracranial or intracranial arterial disease when the clinical picture suggests it. Symptomatic severe carotid stenosis may require revascularization in appropriately selected patients, while all patients benefit from intensive medical risk-factor management. [4,28]

8. Pharmacological Strategies for Stroke Prevention

9. Pharmacological Strategies for Stroke Prevention

Table 2. Common pharmacological approaches