Stroke: Symptoms, Causes, Warning Signs, Treatment
Author: Disabled World (DW)
Updated/Revised Date: 2 Nov 2026
Table of Contents:
Synopsis - Definition - About This Section - FAQs - Publications - Subtopics
Synopsis
An overview of stroke, covering ischemic and hemorrhagic types, warning signs, the STR test, causes, treatment, and what to do during a stroke.
At a Glance
- 1 - About 87% of all strokes are ischemic strokes.
- 2 - Every 3 minutes and 14 seconds, someone in the United States dies of stroke.
- 3 - Only 38% of people in one survey knew all the major stroke symptoms and to call 9-1-1.
- 4 - Clot-busting medicine can be given up to 4.5 hours after symptoms start for many people with an ischemic stroke.
Topic Definition
- Stroke
A stroke, also known as a cerebrovascular accident (CVA) or brain attack, is the sudden loss of brain function that happens when the blood supply to part of the brain is interrupted. That interruption comes in two main forms: an ischemic stroke, in which an artery carrying blood to the brain becomes blocked, and a hemorrhagic stroke, in which a blood vessel bursts and blood leaks into the surrounding brain tissue. When brain cells are deprived of oxygen-rich blood, the affected area can no longer work properly, which may lead to paralysis on one side of the body, trouble speaking or understanding speech, vision loss, dizziness, or sudden confusion. Because outcomes depend heavily on where the stroke occurs and how much tissue is damaged, and because rapid treatment can reverse or limit the harm, a stroke is a medical emergency in which recognizing the warning signs and calling for help immediately can save both life and brain function.
Overview
What is a Stroke?
A stroke, also called a cerebrovascular accident (CVA) or brain attack, is the sudden loss of brain function caused by a problem with the blood supply to the brain. When blood flow to part of the brain is blocked or a blood vessel in the brain bursts, brain cells in that area are starved of oxygen and begin to die within minutes. Depending on where this happens, a stroke can cause weakness or paralysis on one side of the body, trouble speaking or understanding speech, or loss of vision on one side.
Types of Stroke
- Ischemic stroke: an artery carrying blood to the brain is blocked. About 87% of all strokes are ischemic [Centers for Disease Control and Prevention, 2024].
- Hemorrhagic stroke: a blood vessel bursts and blood leaks into or around the brain.
Ischemic strokes are often described by how the blockage forms:
- Thrombotic stroke: a blood clot (thrombus) forms in an artery supplying the brain, usually where fatty plaque has built up. Because the blockage often develops gradually, symptoms may come on more slowly.
- Embolic stroke: a clot or other debris (embolus) forms elsewhere, often in the heart, and travels through the bloodstream until it blocks an artery in the brain.
A transient ischemic attack (TIA), sometimes called a mini-stroke, is a short-lived blockage that causes stroke symptoms that go away on their own. It is a warning sign that a stroke may follow and needs emergency care.
Why Fast Treatment Matters
If a stroke is recognized and treated quickly, its effects can often be greatly reduced. Clot-busting medicine can be given up to 4.5 hours after symptoms start for many people with an ischemic stroke, and a clot can be removed with a catheter (thrombectomy) up to 24 hours later in some patients. Patients who arrive at the emergency room within 3 hours of their first symptoms often have less disability 3 months after a stroke than those whose care is delayed. Yet in one survey, only 38% of people knew all the major stroke symptoms and knew to call 9-1-1 [Centers for Disease Control and Prevention, 2024].
Effects of a Stroke
The effects of a stroke depend on which part of the brain loses its blood supply and how much tissue is damaged. Because each side of the brain controls the opposite side of the body, a stroke on the right side of the brain may cause:
- Weakness or paralysis on the left side of the body
- Vision problems
- Quick, impulsive behavior and changes in judgment
- Memory loss
A stroke on the left side of the brain may cause:
- Weakness or paralysis on the right side of the body
- Trouble speaking or understanding language
- Slow, cautious behavior
- Memory loss
A stroke can affect a person physically, mentally, and emotionally. Some people are unaware of their own disabilities after a stroke, a condition called anosognosia. Depression, anxiety, and changes in mood are common, and some people develop seizures. A severe stroke, or one in a vital area such as the brain stem, can cause coma or death. Stroke is a leading cause of serious long-term disability, and it reduces mobility in more than half of stroke survivors aged 65 and older.
Warning Signs of a Stroke
- Sudden weakness or numbness of the face, arm, or leg, especially on one side of the body
- Sudden confusion, trouble speaking, or trouble understanding speech
- Sudden trouble seeing in one or both eyes
- Sudden dizziness, loss of balance or coordination, or trouble walking
- Sudden severe headache with no known cause
Do not ignore these symptoms, even if they go away within a few minutes and the person seems fine, because they may be a TIA.
Recognizing a Stroke: F.A.S.T. and BE FAST
Health agencies teach F.A.S.T.: Face drooping, Arm weakness, Speech difficulty, Time to call 911. Many hospitals use BE FAST, which adds Balance and Eyes. An older version, sometimes called S.T.R., checks the same signs:
- Smile: ask the person to smile and look for drooping on one side of the face.
- Talk: ask the person to repeat a simple sentence and listen for slurred or strange speech.
- Raise: ask the person to raise both arms and see whether one drifts down.
If the person has trouble with any of these, call 911 right away, and note the time the symptoms began.
What to Do While Waiting for Help
- Stay with the person and keep them calm, and tell them help is on the way.
- If the person is unconscious but breathing, gently roll them onto their side to keep the airway open and let any vomit drain.
- If the person stops breathing normally, start CPR if you are trained.
- Do not give the person anything to eat or drink, because the throat may be affected and they may choke.
- Do not give aspirin or other medicine unless emergency staff tell you to.
- When paramedics arrive, tell them what symptoms you saw and when they began.
Stroke Facts and Statistics
- Every year, more than 795,000 people in the United States have a stroke; about 610,000 of these are first strokes, and nearly 1 in 4 are in people who have had a stroke before.
- Every 3 minutes and 14 seconds, someone in the United States dies of stroke, and stroke was the fourth leading cause of death in America in 2024, after heart disease, cancer, and accidents.
- High blood pressure, high cholesterol, smoking, obesity, and diabetes are leading causes of stroke, and one in three U.S. adults has at least one of these conditions or risk factors.
- Stroke risk rises with age, but strokes can happen at any age: in 2014, 38% of people hospitalized for stroke were younger than 65.
- The risk of a first stroke is nearly twice as high for non-Hispanic Black adults as for White adults.
- Stroke-related costs in the United States came to nearly $56.2 billion between 2019 and 2020.
- Worldwide, stroke caused about 7.3 million deaths in 2021, about 11% of all deaths, and 93.8 million people were living after a stroke.
Lowering high blood pressure is one of the most effective ways to prevent both ischemic and hemorrhagic strokes, and it also helps prevent a second stroke.
Frequently Asked Questions
What is a transient ischemic attack or mini stroke?
A transient ischemic attack is a brief interruption of blood flow to the brain that causes stroke-like symptoms which resolve quickly, and it is a serious warning sign that a full stroke may follow.
Can young people have a stroke?
Yes, although risk rises with age, strokes can occur in young adults, children, and even infants due to factors like congenital conditions, blood disorders, or injury.
How can I reduce my risk of having a stroke?
Managing blood pressure, not smoking, staying active, eating a balanced diet, limiting alcohol, and controlling conditions like diabetes and high cholesterol all help lower stroke risk.
What does stroke recovery and rehabilitation involve?
Recovery often includes physical, occupational, and speech therapy tailored to the person's needs, and progress can continue for months or years depending on the severity and location of the stroke.
Are men or women more likely to have a stroke?
Both men and women are affected, but women have some unique risk factors such as pregnancy and certain hormone therapies, and stroke tends to be more deadly for women overall.
Can a person have more than one stroke?
Yes, having one stroke or a transient ischemic attack increases the risk of another, which is why ongoing prevention and medical follow-up are especially important for survivors.
How is a stroke diagnosed in the hospital?
Doctors use a physical and neurological exam along with imaging such as CT or MRI scans, and sometimes blood tests, to confirm the type and location of a stroke and guide treatment.
What does BE FAST stand for?
BE FAST is a way to remember stroke signs: Balance loss, Eyes or vision changes, Face drooping, Arm weakness, Speech difficulty, and Time to call emergency services. Every minute counts in stroke treatment.
References
- Centers for Disease Control and Prevention. (2024). Stroke facts.
Curated and edited by Ian C. Langtree, Founder and Editor-in-Chief, Disabled World. This section is maintained by the Disabled World editorial team. Last updated: