Understand Stroke

Section 1

What a stroke is

The brain controls movement, sensation, speech, vision, thinking, breathing, and many other functions. A stroke can affect any of these abilities. The exact symptoms depend on which part of the brain is injured and how much tissue is affected.

Stroke is not one single disease. The two broad categories are:

• Ischemic stroke: A clot or severe narrowing blocks blood flow to part of the brain. This is the most common category.
• Hemorrhagic stroke: A blood vessel breaks and blood collects in or around the brain. Intracerebral hemorrhage means bleeding into brain tissue. Subarachnoid hemorrhage means bleeding into the space around the brain, often after an aneurysm—a weakened area of an artery—ruptures.[1–3]

The distinction matters because treatments for a blockage and treatments for bleeding are different. Symptoms alone cannot reliably tell which type is happening. Brain imaging is needed.

Section 2

What is a TIA?

A transient ischemic attack, often called a TIA, causes temporary stroke-like symptoms related to interrupted blood flow. Symptoms may disappear, but that does not make the event safe to ignore. A TIA can be a warning that a stroke may follow, and urgent evaluation is needed to look for the cause and begin prevention.[5]

There is no safe way to decide at home whether temporary symptoms are a TIA, a completed stroke, or another urgent condition. Call emergency services for sudden stroke symptoms even if they improve.

Section 3

What happens during emergency evaluation

The stroke team works on several questions at the same time:

1. When did the person last seem normal? The team asks when symptoms began or when the person was last known to be without them.
2. What changed? A focused neurologic examination checks movement, sensation, speech, vision, coordination, alertness, and other functions.
3. Is there bleeding? A head CT scan is commonly the first brain image because it can quickly show bleeding. MRI or blood-vessel imaging may be added when it will change the next decision.[1–3]
4. Could something else be causing the symptoms? Blood sugar is checked because very low or very high glucose can mimic or complicate stroke. Other blood tests, heart rhythm testing, and medical history help guide care.[1]
5. Is an emergency treatment possible? The answer depends on the stroke type, time, imaging, medical history, medicines, and the expected benefits and risks for that person.

Testing is not a delay that happens before stroke care. It is part of the emergency decision.

Section 4

Treatment concepts

If an artery is blocked

Selected people with ischemic stroke may receive an intravenous clot-dissolving medicine. Selected people with a blockage in a large brain artery may undergo mechanical thrombectomy, a procedure in which specialists remove the clot through a catheter placed inside an artery. These treatments are highly time-sensitive, but not everyone is eligible. Imaging, symptom severity, time, bleeding risk, and other factors guide the choice.[1]

If there is bleeding

Care for hemorrhagic stroke focuses on limiting further bleeding and preventing complications. Depending on the cause, treatment may include careful blood-pressure management, reversal of blood-thinning medicine, neurosurgical or neurointerventional evaluation, treatment of an aneurysm, and specialized monitoring.[2,3]

No general article can determine which treatment is appropriate for an individual patient.

Section 5

Hospital care after the first decision

Stroke care continues after emergency treatment. A specialized stroke or neurocritical-care team watches for changes and treats problems involving breathing, blood pressure, temperature, blood sugar, heart rhythm, brain swelling, seizures, blood clots, infection, and nutrition when relevant.[1–3]

Swallowing may be unsafe after a stroke even when the problem is not obvious. Hospitals screen swallowing before food, drink, or pills are given by mouth when appropriate. If a problem is found, a speech-language pathologist or other trained clinician performs a fuller assessment and develops an individual plan.[1,4]

Early rehabilitation assessment helps identify needs involving movement, daily activities, speech, language, swallowing, thinking, vision, mood, and caregiver support.[4]

Section 6

Planning for discharge

Before leaving the hospital or rehabilitation setting, patients and families should know:

• the stroke type and the suspected cause, when known;
• the current medication list and what each medicine is for;
• warning signs that require emergency action;
• follow-up appointments and pending test results;
• rehabilitation or home-service plans;
• any current instructions about swallowing, mobility, driving, work, or other safety concerns; and
• whom to contact for nonemergency questions.[4,5]

It is reasonable to ask for the plan in writing and to repeat it back in your own words. New information can be hard to absorb during a stressful hospital stay.

Section 7

Questions to carry forward

Useful questions for the treating team include:

• What type of stroke occurred?
• What cause is most likely, and what testing is still pending?
• Which treatments were used, and what should we watch for now?
• What rehabilitation needs were identified?
• Which medicines are intended to prevent another stroke?
• What symptoms should make us call 911?

This overview connects to Act Now, Recovery and Daily Life, and Prevent Another Stroke. Those pages address emergency recognition, rehabilitation, and prevention in more depth.