What is a Stroke

What is a Stroke?

A stroke happens when the blood supply to part of the brain is suddenly interrupted or reduced, depriving brain tissue of oxygen and nutrients. Without blood flow, brain cells begin to die within minutes.

The effects of a stroke depend on which part of the brain is affected and how much tissue is damaged. Because different areas of the brain control different functions, a stroke can affect:

Movement
Speech
Vision
Memory
Swallowing
or any combination of these, depending on its location.

Stroke is the third leading cause of death in Malaysia, following ischaemic heart disease and pneumonia. It is also a leading cause of long-term disability.

men having headache

Types of Strokes

1. Ischaemic Stroke

Ischaemic Stroke

Ischaemic stroke occurs when a blood vessel supplying the brain becomes blocked, usually by a blood clot. This blockage cuts off blood flow to the area of the brain beyond it, causing that tissue to be deprived of oxygen. Ischaemic stroke is by far the most common type, accounting for approximately 76 to 85% of all stroke cases in Malaysia.

Blood clots that cause ischaemic stroke can form in two main ways:

Clot forms directly in the brain (Thrombotic Stroke) — A clot may form within a narrowed artery in the brain itself, often due to a build-up of fatty deposits over time.
Clot travels from elsewhere in the body (Embolic Stroke) — A clot may form elsewhere, commonly in the heart, and travel through the bloodstream until it lodges in a smaller blood vessel in the brain.

2. Haemorrhagic Stroke

Haemorrhagic Stoke

Haemorrhagic stroke occurs when a blood vessel in or around the brain ruptures and bleeds. The bleeding both deprives the surrounding brain tissue of blood and causes pressure to build up inside the skull, which can damage brain cells further. Although haemorrhagic stroke is less common than ischaemic stroke, it tends to be more severe and carries a higher risk of death or significant disability.

Common causes of haemorrhagic stroke include:

High blood pressure — Long-standing, poorly controlled high blood pressure gradually weakens blood vessel walls over time, making them more prone to rupture.
Aneurysms — Weak, bulging points in a blood vessel wall that can rupture and bleed into the surrounding brain tissue.
Arteriovenous malformations (AVMs) — Abnormal tangles of blood vessels that are present from birth and can bleed unpredictably.

3. Transient Ischaemic Attack (TIA), or Mini Stroke

Mini Stroke - Transient Ischaemic Attack

A transient ischaemic attack, often called a mini stroke, occurs when blood flow to part of the brain is temporarily blocked. The symptoms are identical to those of a full stroke, but they resolve on their own, usually within minutes to a few hours, and do not cause lasting damage that can be seen on standard imaging.

Despite resolving on its own, a TIA should never be treated as a minor event. It is a serious warning sign that the same blood vessel problem that caused the TIA could cause a full, permanent stroke soon.

How Common Is Stroke in Malaysia?

Stroke is a significant and growing public health concern in Malaysia. Beyond ranking as the third leading cause of death nationally, data from Ministry of Health hospital admissions between 2008 and 2016 found a substantial increase in stroke incidence among people under the age of 65, with the sharpest rise occurring in the 35 to 39 year age group, increasing by 53.3% in men and 50.4% in women over that period.

This trend reflects a broader pattern across Malaysia and the wider Southeast Asian region, where rising rates of high blood pressure, diabetes, and obesity are contributing to strokes occurring at younger ages than in the past.

Frequently Asked Questions

Can a stroke be hereditary?

Stroke itself is not directly inherited, but certain risk factors that increase the chance of having a stroke can run in families, including high blood pressure, diabetes, high cholesterol, and certain heart conditions. Having a family history of stroke may mean it is worth discussing your personal risk with a doctor, particularly if multiple close relatives have been affected.

Does stroke always cause permanent disability?

Not always. The outcome of a stroke varies significantly depending on its severity, the part of the brain affected, how quickly treatment was received, and the quality of rehabilitation that follows. Some patients recover fully, particularly after a mild stroke or prompt treatment, while others experience lasting effects of varying degrees. Early treatment and early rehabilitation both play a significant role in maximising recovery.

What part of the brain is most affected by stroke?

This varies from patient to patient, as a stroke can occur in any part of the brain depending on which blood vessel is affected. However, strokes affecting the brain's large hemispheres, particularly areas controlling movement and speech, are commonly seen because these regions are supplied by major arteries that are more frequently involved in both clot-related and bleeding-related strokes.

What is the difference between ischaemic and haemorrhagic stroke?

Ischaemic stroke is caused by a blockage that stops blood from reaching part of the brain, while haemorrhagic stroke is caused by bleeding that damages brain tissue directly and raises pressure inside the skull. Because the two have opposite underlying causes, they require opposite treatment approaches, which is why accurate brain imaging is always carried out before any stroke treatment begins.

Can young people get a stroke?

Yes. While stroke risk increases with age, it is not limited to older adults. Hospital data in Malaysia shows a clear rise in stroke cases among people in their 30s and 40s, often linked to uncontrolled high blood pressure, diabetes, heart conditions, or lifestyle factors. Because stroke is still widely seen as an older person's condition, symptoms in younger patients are sometimes dismissed or mistaken for something else, which can delay urgent treatment.

From Understanding to Action

Understanding what a stroke is, and recognising that it can happen to anyone at any age, is the first step toward acting quickly when it matters most. Knowing the warning signs and how to respond can make a meaningful difference to recovery.

Learn more about stroke care at our Stroke Centre in Penang