Stroke is the second leading cause of death worldwide and the leading cause of adult disability. Every minute of delayed treatment costs approximately 1.9 million neurons. Yet up to 80% of strokes are preventable through lifestyle modification. This guide covers recognition, types, emergency response, recovery, and the evidence-backed strategies that reduce risk.
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Coeheal Editorial Team
Coeheal Editorial Team
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Coeheal Editorial Team
Editorially reviewed for accuracy against cited sources. This is an editorial review, not a medical or clinical review. For personalised health advice, consult a qualified healthcare professional.
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What Is a Stroke? A stroke occurs when blood supply to part of the brain is suddenly interrupted, causing brain cells to die from lack of oxygen and glucose. There are two main types: ischaemic stroke (87% of cases), caused by a blood clot blocking an artery supplying the brain, and haemorrhagic stroke (13% of cases), caused by a blood vessel rupturing and bleeding into or around the brain. A third category — subarachnoid haemorrhage — occurs when bleeding happens in the space between the brain and its surrounding membrane, typically from a ruptured aneurysm. The consequences of stroke depend on which part of the brain is affected and how quickly blood flow is restored. The brain consumes 20% of the body's oxygen despite being only 2% of its weight — it has virtually no energy reserves and begins to die within minutes of blood flow interruption.
Recognising Stroke: FAST and BE-FAST. The FAST acronym (Face drooping, Arm weakness, Speech difficulty, Time to call emergency services) identifies approximately 85% of strokes. The expanded BE-FAST adds Balance problems and Eye (vision) changes as earlier warning signs. Additional symptoms include sudden severe headache ('the worst headache of my life' — a classic description of subarachnoid haemorrhage), sudden confusion or difficulty understanding, and sudden numbness or weakness on one side of the body. Time is the most critical factor in stroke treatment. For ischaemic stroke, intravenous thrombolysis (tPA) must be given within 4.5 hours of symptom onset, and mechanical thrombectomy (physically removing the clot) is effective up to 24 hours in selected patients. Every 15-minute reduction in door-to-treatment time improves outcomes significantly. Call emergency services immediately — do not drive yourself or wait to see if symptoms improve.
Ischaemic Stroke: Causes and Treatment. Ischaemic stroke is caused by the same mechanisms as TIA: cardioembolism (clots from the heart, most commonly from atrial fibrillation), large artery atherosclerosis (plaque rupture in the carotid or vertebral arteries), small vessel disease (lacunar infarcts from hypertensive damage to small penetrating arteries), and cryptogenic stroke (no identified cause, approximately 25% of cases). Emergency treatment for ischaemic stroke is intravenous alteplase (tPA) within 4.5 hours, and mechanical thrombectomy for large vessel occlusion within 24 hours. These treatments can dramatically reduce disability — thrombectomy for large vessel occlusion produces functional independence in approximately 46% of treated patients versus 26% of controls. Secondary prevention includes antiplatelet therapy, anticoagulation for AF, statin therapy, blood pressure management, and lifestyle modification.
Haemorrhagic stroke is caused by rupture of a blood vessel, most commonly due to hypertension (which weakens vessel walls over time), cerebral amyloid angiopathy (deposition of amyloid protein in vessel walls, associated with Alzheimer's disease), arteriovenous malformations (abnormal tangles of blood vessels present from birth), aneurysms (bulges in vessel walls that can rupture), and anticoagulant medications (which increase bleeding risk). Management focuses on controlling bleeding, reducing intracranial pressure, and preventing rebleeding. Blood pressure is aggressively lowered. Anticoagulants are reversed. Surgery may be required for large haematomas or ruptured aneurysms. Haemorrhagic stroke has a higher short-term mortality than ischaemic stroke (30-day mortality approximately 40% vs 10%), but survivors often have better long-term functional recovery.
Stroke Recovery: Neuroplasticity and Rehabilitation. The brain has a remarkable capacity for reorganisation after injury — a property called neuroplasticity. In the weeks and months after stroke, surviving neurons can form new connections, and adjacent brain regions can take over functions previously performed by the damaged area. This recovery is not passive — it requires intensive, repetitive practice of the affected functions. Rehabilitation begins in the acute phase (within 24–48 hours of stabilisation) and continues for months to years. Physical therapy addresses motor function and mobility. Occupational therapy addresses activities of daily living. Speech and language therapy addresses aphasia (language impairment) and dysphagia (swallowing difficulty). Cognitive rehabilitation addresses attention, memory, and executive function. The intensity and specificity of rehabilitation are the primary determinants of recovery — more practice produces more recovery. Constraint-induced movement therapy (CIMT), which forces use of the affected limb by restraining the unaffected one, has strong evidence for improving arm function.
Natural Prevention: The Evidence Base. Up to 80% of strokes are preventable through lifestyle modification. The most impactful interventions are: Blood pressure control — hypertension is responsible for approximately 35% of strokes. Every 10 mmHg reduction in systolic BP reduces stroke risk by 27%. The DASH and Mediterranean diets are the most evidence-backed dietary approaches. Atrial fibrillation management — AF increases stroke risk 5-fold. Detection (through pulse palpation, ECG, or wearable devices) and treatment (anticoagulation) are critical. Physical activity — 150+ minutes per week of moderate aerobic exercise reduces stroke risk by 25–30%. Exercise reduces blood pressure, improves lipid profile, reduces AF risk, and improves insulin sensitivity. Smoking cessation — smoking doubles stroke risk. Risk returns to near-baseline within 5 years of cessation. Diet — the Mediterranean diet reduces stroke risk by approximately 30% in high-risk individuals (PREDIMED trial). Key components include olive oil, fish, nuts, vegetables, legumes, and moderate red wine. Omega-3 fatty acids reduce triglycerides and have anti-thrombotic effects. Potassium-rich foods (vegetables, legumes, fruits) reduce blood pressure. Alcohol — heavy drinking significantly increases both ischaemic and haemorrhagic stroke risk. Moderate consumption (1 drink/day for women, 2 for men) has a neutral or slightly protective effect for ischaemic stroke, but no safe level exists for haemorrhagic stroke.
Supplements with Evidence for Stroke Prevention. Omega-3 fatty acids (EPA + DHA, 2–4 g/day) reduce triglycerides, lower blood pressure modestly, and have anti-thrombotic effects. The REDUCE-IT trial showed a 25% reduction in cardiovascular events with high-dose EPA. Magnesium deficiency is associated with hypertension and increased stroke risk. Supplementation in deficient individuals reduces blood pressure. Folate and B vitamins (B6, B12, folate) reduce homocysteine levels — elevated homocysteine is an independent risk factor for stroke. Coenzyme Q10 (CoQ10) reduces blood pressure modestly and improves endothelial function. Nattokinase has fibrinolytic activity and may reduce blood viscosity and fibrinogen. Evidence is preliminary but promising. Vitamin D deficiency is associated with increased stroke risk — supplementation to achieve adequate levels (50–60 ng/mL) is reasonable. Note: supplements should complement, not replace, evidence-based medical management of stroke risk factors.
Life After Stroke: Emotional and Cognitive Recovery. Post-stroke depression affects approximately 30–40% of stroke survivors and significantly impairs rehabilitation and recovery. It is caused by a combination of neurobiological changes (damage to monoaminergic pathways), psychological adjustment to disability, and social isolation. Treatment includes antidepressants, psychotherapy, and social support. Post-stroke fatigue is one of the most common and disabling symptoms — affecting 40–70% of survivors — and is often underrecognised and undertreated. Cognitive impairment affects approximately 30% of stroke survivors and ranges from mild memory problems to vascular dementia. Regular aerobic exercise, cognitive stimulation, social engagement, and optimal management of vascular risk factors are the most evidence-backed strategies for preserving cognitive function after stroke. Recovery continues for years after stroke — the brain's capacity for reorganisation does not have a fixed endpoint, and continued rehabilitation and healthy lifestyle choices support ongoing recovery.
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