If you think you or someone near you is having a stroke, call 911 right now. Do not drive yourself or the person to the hospital, do not wait to see whether the symptoms pass, and do not take aspirin on your own. Paramedics start the assessment on the road, alert the stroke team before arrival, and route to a hospital equipped to treat you — none of which happens in a private car. Every minute of an untreated stroke destroys roughly 1.9 million neurons.
Recognizing a stroke: BE-FAST
The older FAST checklist covers face, arms, speech, and time. BE-FAST adds Balance and Eyes at the front, because a substantial minority of strokes affect the back of the brain — the posterior circulation — where there may be no facial droop and no arm weakness at all. Those are the strokes plain FAST misses. One letter is enough to justify calling 911.
| Letter | What to check | What it looks like |
|---|---|---|
| B — Balance | Sudden loss of coordination | Staggering, veering to one side, severe spinning dizziness |
| E — Eyes | Sudden change in vision | Loss of sight in one eye, double vision, or a missing half-field |
| F — Face | Ask for a smile | One side of the mouth droops; the smile is lopsided |
| A — Arms | Ask them to raise both arms | One arm drifts down or will not lift; sudden one-sided numbness |
| S — Speech | Ask for a simple sentence | Slurred or wrong words; cannot understand you |
| T — Time | Call 911 immediately | Note when the person was last seen normal — that clock drives treatment |
Remember the last known well time. If someone woke with symptoms, that time is when they went to bed, and imaging can often still find treatable tissue. Tell the dispatcher you suspect a stroke — that phrase changes how the call is handled.
What is a stroke?
A stroke happens when blood flow to part of the brain stops, or when a vessel ruptures. Brain tissue holds almost no energy reserve, so neurons deprived of oxygen begin failing within minutes. Whatever that region controlled — moving an arm, finding words, seeing the left half of a room — goes offline in the same instant.
Around the dying core sits the penumbra: starved but still living tissue. It is what emergency treatment tries to rescue, and it shrinks continuously. That is why speed matters — restoring flow at ninety minutes saves far more of it than at six hours, even when both fall inside an accepted window.
Types of stroke
Ischemic stroke accounts for roughly 87 percent of cases: a clot blocks an artery feeding the brain, forming on a diseased vessel wall or traveling there from the heart or neck. Hemorrhagic stroke, about 13 percent, occurs when a vessel bursts and blood pushes into brain tissue, damaging it by starving the downstream area and by raising pressure inside the skull. A transient ischemic attack, or TIA, is a temporary blockage that clears before permanent injury.
Both look identical at the bedside. Nothing observable from outside separates a clot from a bleed — only a CT or MRI scan can. That distinction reverses the treatment: an ischemic stroke may be treated by dissolving or removing the clot, while the same treatment during a hemorrhage would be catastrophic.
This is why you must not take aspirin on your own for suspected stroke symptoms. Aspirin thins the blood. If the stroke is one of the roughly one in eight that is hemorrhagic, aspirin makes the bleeding and the outcome worse. Advice about chewing aspirin applies to suspected heart attacks, not strokes. Only a clinician who has imaged the brain can decide whether any blood thinner belongs in the picture.
Symptoms beyond the classic signs
Posterior circulation strokes, affecting the brainstem and cerebellum, can present as violent vertigo with vomiting, double vision, unrelenting hiccups, difficulty swallowing, unsteadiness, or numbness on one side of the face and the opposite side of the body — often misread as an inner ear problem or a migraine.
Women more often report symptoms outside the classic list: sudden severe headache, unexplained confusion, generalized weakness, nausea, fainting, or agitation. These are diagnosed more slowly, which costs treatment time.
Two features separate stroke from most mimics: onset is abrupt, arriving in seconds rather than over hours, and the deficit is focal — a specific lost function rather than feeling generally unwell. Gradual, painless facial weakness that includes the forehead is more likely a peripheral facial nerve palsy than a stroke, but that call belongs to a clinician.
Transient ischemic attack: a warning, not a reprieve
A TIA produces genuine stroke symptoms that resolve, usually within minutes. The relief people feel when symptoms disappear is the most dangerous part of the condition, because it is what persuades them not to seek care.
Symptoms resolving does not mean it was safe. A TIA means a clot reached your brain and then broke up. Whatever produced it is still there. The risk of a full stroke afterward is heavily front-loaded — a meaningful share occur within the first 48 hours and many more within the first week. That window is also when treatment does the most good: urgent evaluation with antiplatelet therapy and risk-factor control substantially cuts recurrence.
The rule is simple. Symptoms now means call 911. Symptoms that have already resolved means same-day emergency evaluation, not an appointment next week.
Causes and risk factors
Most strokes trace to risk factors that can be measured and modified. High blood pressure is the largest contributor to both types, and controlling the elevated blood pressure that damages arterial walls lowers risk more than any other intervention. Smoking roughly doubles risk and is reversible after quitting.
Cholesterol-driven plaque narrows the arteries feeding the brain, and the process producing arterial plaque that ruptures and forms clots is at work in the carotid arteries. People with diabetes that accelerates vascular disease body-wide face roughly double the risk. Obesity, inactivity, heavy alcohol use, sleep apnea, and untreated atrial fibrillation complete the modifiable list. Age, family history, prior stroke, sickle cell disease, and preeclampsia cannot be changed but should be known.
Stroke is not only a disease of older adults. Incidence under 50 has risen for two decades, and roughly one in ten strokes now occurs below that age. Young patients are the most likely to be misdiagnosed or discharged, because clinicians reach for commoner explanations of dizziness or headache in a 35-year-old. Causes skew differently too: arterial dissection, patent foramen ovale, clotting disorders, and stimulant use. If you are young with sudden neurological symptoms, say the word stroke out loud in the emergency department.
How stroke is diagnosed
Imaging comes first and fast. A non-contrast CT of the head, done within minutes of arrival, answers the question that must come first: is there blood? CT angiography then looks for a large vessel occlusion that could be removed, and CT perfusion or MRI maps how much tissue is lost versus salvageable.
The workup then shifts to finding the cause, because the cause determines prevention. Cardiac monitoring, sometimes extended for weeks with a wearable device, hunts for intermittent atrial fibrillation, and an irregular heart rhythm that throws clots to the brain explains many otherwise unexplained strokes. Carotid ultrasound checks the neck arteries, and echocardiography looks inside the heart for clots, valve disease, or a hole between the chambers.
The blood tests that matter
Bloodwork rules out mimics and finds causes. Glucose is checked immediately, because severe hypoglycemia can mimic a stroke exactly and is reversed in minutes; longer term, tracking a fasting glucose level that reveals hidden metabolic risk guides prevention. A complete blood count that flags anemia, infection, or low platelets is standard, alongside coagulation tests showing whether the blood is already thinned.
Beyond the emergency the panel widens: a lipid profile with the LDL cholesterol that drives plaque formation, HbA1c for undiagnosed diabetes, and kidney and liver function. In younger patients, clinicians add autoimmune and clotting panels — antiphospholipid antibodies, thrombophilia testing, and a homocysteine level that can point to an inherited metabolic disorder.
Emergency treatment
For ischemic stroke, intravenous thrombolysis uses a clot-dissolving drug given through a vein, generally within 4.5 hours of last known well time, with imaging-selected use extending further in some patients. Tenecteplase, a single injection, is increasingly used in place of alteplase.
Mechanical thrombectomy treats large vessel occlusions by threading a catheter up to the blocked brain artery and removing the clot with a stent retriever or suction device. Selected patients benefit up to 24 hours after onset when imaging shows salvageable tissue. These widening windows are a reason for hope, not a reason to wait: outcomes degrade with every hour, most patients do not qualify for the late windows, and only imaging can tell who does. No one should self-triage on the clock.
Hemorrhagic stroke is managed differently — rapid controlled blood pressure lowering, immediate reversal of any anticoagulant, and neurosurgical evaluation. Delivered as a bundle in the first hour, these steps improve survival. Every patient does better in a dedicated stroke unit, where staff assess swallowing before the first sip of water, control temperature, glucose and oxygen, and prevent the pneumonia and clots that cause much avoidable harm.
Recovery and rehabilitation
Rehabilitation begins in the hospital, often within a day or two. Physical therapy rebuilds strength and walking; occupational therapy targets daily tasks; speech therapy addresses aphasia — the loss of the ability to produce or understand language — and unsafe swallowing.
The brain’s capacity to reorganize is real but responds to the volume and intensity of practice. The first three to six months bring the fastest gains, though improvement continues for years. Recovery is rarely linear and fatigue is nearly universal. Post-stroke depression affects roughly a third of survivors, is a medical consequence rather than a character failing, and treating it improves physical recovery.
Preventing a first or second stroke
Prevention runs on measurement. Know your blood pressure and treat it to target. Know your lipid numbers and treat elevated LDL when your risk warrants it. Know whether you have diabetes or prediabetes, and ask whether your heart rhythm has been checked, especially after 65. Stop smoking. Aim for regular activity, limit sodium and alcohol, and get evaluated for sleep apnea if you snore heavily.
After a stroke or TIA, secondary prevention is tailored to the cause: antiplatelet therapy for most clot-related strokes, anticoagulation when atrial fibrillation is found, carotid surgery for significant narrowing, and tight control of blood pressure, cholesterol, and glucose. Adherence matters more than any single drug choice, because the highest-risk period is the weeks right after the first event.
Latest scientific advances
Thrombectomy for strokes once considered untreatable. The SELECT2 trial randomized 352 patients whose strokes had already destroyed a large volume of brain tissue — a group historically excluded from clot removal — to thrombectomy plus medical care or to medical care alone, within 24 hours of onset. It stopped early for benefit: 20 percent of thrombectomy patients were functionally independent at 90 days versus 7 percent, with similar mortality (Sarraj et al., 2023). What this means for you: even a stroke that looks devastating on the first scan may be treatable, so the decision belongs to a hospital, not to a judgment call at home.
A faster clot-dissolving drug. The ORIGINAL trial randomized 1,489 patients with acute ischemic stroke within 4.5 hours of onset to tenecteplase, given as one injection, or alteplase, infused over an hour. An excellent outcome at 90 days occurred in 72.7 percent of the tenecteplase group versus 70.3 percent with alteplase, meeting the noninferiority threshold, with symptomatic brain bleeding in 1.2 percent of each group (Meng et al., 2024). What this means for you: the newer drug works at least as well and is quicker to give.
Where stroke care now stands. A 2024 Lancet review noted that stroke affects up to one in five people during their lifetime in some high-income countries, and that thrombectomy indications have expanded to include larger core infarcts and basilar artery occlusion, with the window reaching 24 hours (Hilkens et al., 2024). What this means for you: who can be treated has widened, so assumptions about being too late are often out of date.
Myths and facts
| Myth | Fact |
|---|---|
| Take an aspirin while you wait for help | About one in eight strokes is a bleed, and aspirin makes bleeding worse. Wait for imaging. |
| If symptoms go away, it was nothing | That is a TIA; it carries a high short-term risk of a full stroke. Get evaluated the same day. |
| Driving to the ER saves time | Ambulances pre-notify the stroke team and pick the hospital. Private cars do neither. |
| Strokes only happen to older people | Roughly one in ten occurs under age 50, and incidence in young adults is rising. |
Glossary
| Term | Meaning |
|---|---|
| Ischemic stroke | A clot blocking blood flow to the brain; about 87 percent of cases. |
| Hemorrhagic stroke | A stroke caused by a ruptured vessel bleeding into or around the brain. |
| Transient ischemic attack | Stroke symptoms that resolve without permanent damage; a warning of high short-term risk. |
| Penumbra | Starved but salvageable tissue around the dying core. |
| Thrombolysis | Treatment with a drug that dissolves a clot, given through a vein. |
| Thrombectomy | A catheter procedure that physically removes a clot from a large brain artery. |
| Last known well time | The last moment the person was seen normal; the clock that drives eligibility. |
Frequently asked questions
What are the first signs of a stroke?
The first signs are sudden and one-sided: a drooping face, weakness or numbness in one arm, slurred speech. BE-FAST adds two warnings plain FAST misses — sudden loss of balance and sudden vision change, including double vision or loss of sight in one eye. Sudden severe headache, confusion, or trouble swallowing also count. A single sign is enough: call 911 rather than waiting to see whether it fades.
What is a mini stroke, and is it serious?
A mini stroke is a transient ischemic attack: stroke symptoms from a clot that clears on its own, usually within minutes. Nothing about it is minor — a clot reached your brain and the cause is still there. Risk of a full stroke is highest in the first 48 hours and stays elevated for weeks. A TIA needs same-day emergency evaluation, because urgent treatment then sharply reduces the chance of a disabling stroke.
What are the different types of stroke?
There are three. Ischemic stroke, roughly 87 percent of cases, comes from a clot blocking an artery to the brain. Hemorrhagic stroke, about 13 percent, comes from a ruptured vessel bleeding into brain tissue. A transient ischemic attack is a temporary blockage that resolves before permanent damage. They look identical from outside, so only a brain scan tells them apart — and that decides whether clot-busting treatment is lifesaving or dangerous.
Are stroke symptoms different in women?
Often, yes. Women more frequently report symptoms outside the classic list: sudden severe headache, unexplained confusion, generalized weakness, nausea, fainting, or agitation. These are easier to attribute to something else, which is one reason women are diagnosed more slowly and lose treatment time. Pregnancy-related conditions such as preeclampsia add further risk. Any sudden, unexplained neurological symptom deserves a 911 call, textbook picture or not.
What does stroke treatment involve?
For ischemic stroke, treatment may include a clot-dissolving drug given through a vein, generally within 4.5 hours of last known well time, and mechanical thrombectomy to remove a large clot with a catheter, in selected patients up to 24 hours after onset. Hemorrhagic stroke is treated with rapid blood pressure control, reversal of blood thinners, and sometimes surgery. Imaging decides which applies, which is why arrival cannot wait.
Sources
- Centers for Disease Control and Prevention — Stroke Facts — CDC, 2024 — cdc.gov
- National Institute of Neurological Disorders and Stroke — Stroke — NIH/NINDS, 2024 — ninds.nih.gov
- American Stroke Association — Stroke Symptoms — AHA/ASA, 2024 — stroke.org
- Mayo Clinic — Stroke — Mayo Clinic, 2024 — mayoclinic.org
- Sarraj A, et al. — Trial of Endovascular Thrombectomy for Large Ischemic Strokes — New England Journal of Medicine, 2023 — doi.org
- Meng X, et al. — Tenecteplase vs Alteplase for Acute Ischemic Stroke: The ORIGINAL Trial — JAMA, 2024 — doi.org
- Hilkens NA, et al. — Stroke — The Lancet, 2024 — doi.org
Further reading
- The plaque process behind stroke also drives coronary artery disease affecting the vessels of the heart.
- Clinicians often add inflammation to the picture by ordering a C-reactive protein test that measures systemic inflammation.
- Anyone reviewing a lipid panel should learn to interpret the total cholesterol figure that summarizes your lipid profile.
- Clot disorders are often investigated using a D-dimer test that detects clot breakdown.
Understand your lab results with BloodSense
Much of what determines your stroke risk shows up in routine blood work long before anything goes wrong. A risk-factor panel typically covers a lipid profile, fasting glucose and HbA1c, a complete blood count, kidney function, and inflammatory markers such as C-reactive protein. Individually these are numbers on a page; together they describe how your arteries are aging.
BloodSense reads your uploaded results, explains each marker in plain language, shows where you sit against reference ranges, and highlights the patterns worth raising with your doctor.
