Stroke: Recognising Symptoms, Acting Fast and Prevention

At a glance

What is it? An emergency: part of the brain suddenly loses its blood supply and nerve cells start to die.
Most important test The FAST test (Face, Arms, Speech, Time). At even one sign, call the emergency number at once.
Two forms A blocked vessel (ischemic stroke, about 85 percent) and bleeding in the brain (about 15 percent).
Key symptoms Sudden one-sided weakness, speech problems, vision problems, dizziness, severe headache.
Key factor Speed: the faster the treatment, the more brain can be saved.
ICD-10 I63 (infarction), I61 (bleed), G45 (TIA)

Recognising a stroke: the FAST test

A stroke is always an emergency. The faster it is treated, the more brain can be saved. With the FAST test you can spot the key signs in under a minute. FAST stands for Face, Arms, Speech and Time.

  • F for Face: ask the person to smile. Does one corner of the mouth droop, or is the face twisted to one side?
  • A for Arms: ask the person to raise both arms. Does one arm drift down or cannot be held up?
  • S for Speech: ask the person to repeat a simple sentence. Is the speech slurred or are the words missing?
  • T for Time: even one sign means every minute counts. Call the emergency number at once (112, in the US: 911).
In an emergency: call at once (112, in the US: 911) Do not wait to see whether the symptoms go away on their own, and do not drive to the hospital yourself. Call the emergency number straight away, even if the signs disappear after a short time. A transient circulation problem (TIA) is also a serious warning sign. Note when the symptoms began, because that is crucial for treatment.

What is a stroke?

In a stroke, part of the brain suddenly no longer gets enough blood. The affected nerve cells lose their oxygen supply and die within a short time. Depending on the brain region involved, functions such as movement, speech or vision can fail.

Experts say: time is brain. In an untreated stroke, millions of nerve cells are lost every minute. That is exactly why every minute counts. There are two main forms with opposite causes (more on this below): a blocked vessel (ischemic stroke) and bleeding in the brain (haemorrhagic stroke).

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Symptoms and warning signs

The symptoms typically appear suddenly, often without warning. Which ones depends on the affected part of the brain:

  • sudden weakness or numbness on one side of the body, in the face, arm or leg. More on this: One-sided weakness.
  • sudden trouble speaking or understanding.
  • sudden vision problems in one or both eyes, or double vision.
  • sudden dizziness with problems walking or keeping balance.
  • a sudden, very severe headache for no clear reason, especially with a bleed.
  • sudden confusion.

Important: even if such symptoms disappear after minutes, a transient circulation problem (TIA) may be behind them. A TIA is a serious warning sign of an impending stroke and must be checked just as urgently.

The two types: infarction and bleed

Not every stroke is the same. The two forms have opposite causes, and that has direct consequences for treatment.

85 percent Ischemic stroke (infarction)

The most common form. A blood clot blocks a vessel in the brain, often on the basis of furred-up vessels or from a clot from the heart. Here the aim is to dissolve or remove the clot quickly.

15 percent Haemorrhagic stroke (bleed)

A vessel in the brain bursts, and the blood damages the surrounding tissue. Here a clot-dissolving drug would be dangerous. That is why the hospital first uses imaging to find out which form is present.

Causes and risk factors

Most risk factors can be influenced. The main ones are:

  • High blood pressure: the most important risk factor. More on this: High blood pressure.
  • Atrial fibrillation: in this heart rhythm disorder, clots can form and travel to the brain. More on this: Atrial fibrillation.
  • Diabetes, high blood lipids, excess weight and lack of exercise.
  • Smoking and excessive alcohol.
  • a previous stroke or TIA as well as older age.

Acute treatment

In hospital, imaging (usually a CT scan) is used first to find out whether there is an infarction or a bleed, because the treatment is opposite. With an ischemic stroke the aim is to remove the clot as fast as possible:

  • Thrombolysis (clot-busting): a drug dissolves the clot. It usually works within four and a half hours of symptom onset, and the earlier the better.
  • Thrombectomy: for large vessel blockages, the clot is removed mechanically through a catheter, in selected cases up to 24 hours after onset.
  • Stroke unit: treatment on a specialised stroke ward clearly improves the outcome.

With a bleed, other measures come first: lowering blood pressure, reversing any blood-thinning effect of medication, stopping the bleeding and, in some cases, surgery.

Secondary prevention: avoiding a second stroke

After a stroke, the risk of another one is increased. Secondary prevention is meant to prevent exactly that. Which medication is used depends crucially on the cause. This is the most important point that many guides leave out: a blood thinner is not just a blood thinner.

Cause of the stroke Drug group Examples Why
Atrial fibrillation (clot from the heart) Anticoagulants DOACs such as apixaban, rivaroxaban, edoxaban, dabigatran Clots from the heart need stronger inhibition of blood clotting
Furred-up vessels (without atrial fibrillation) Antiplatelet drugs ASA (aspirin), clopidogrel They prevent platelets from clumping on the vessel walls

Scroll the table sideways →

Apixaban (a DOAC)
When: after a stroke caused by atrial fibrillation. What: a direct anticoagulant that lowers the risk of new clots from the heart and is often preferred over older drugs such as phenprocoumon. Important: never stop it on your own, watch for signs of bleeding. Details: Apixaban.
Clopidogrel (an antiplatelet drug)
When: after a stroke caused by furred-up vessels, alone or temporarily together with ASA. What: it stops platelets from clumping. Important: do not stop it on your own, watch the bleeding risk. Details: Clopidogrel.

Further building blocks almost always come on top: lowering blood pressure consistently, a statin against high blood lipids, managing diabetes well and stopping smoking. With a severely narrowed carotid artery, a procedure can also make sense.

Never stop blood thinners on your own Anticoagulants and antiplatelet drugs protect against another stroke. Stopping them without medical advice risks exactly that. At the same time, they raise the bleeding risk. Always discuss changes, including before operations or dental procedures, with your doctor.
Medication plan

Blood thinners and more: never miss a dose.

After a stroke, reliable daily intake is what matters. brite reminds you, warns about interactions and keeps your plan ready for your next appointment.

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Rehabilitation and life afterwards

Many effects of a stroke partly recede over time, especially when rehabilitation starts early. The brain can reorganise tasks to some extent. Depending on the deficit, different therapies help:

  • physiotherapy for mobility, strength and balance.
  • speech and language therapy for speech and swallowing problems.
  • occupational therapy to retrain everyday tasks.

Patience and regular practice are key. Relatives also play an important role.

Prevention: lowering the risk

A large share of strokes could be avoided through factors you can influence. What helps most:

  • keeping your blood pressure in the target range, the strongest lever.
  • having atrial fibrillation detected and treated.
  • not smoking and drinking alcohol only in moderation.
  • exercising regularly and watching your weight.
  • keeping an eye on blood lipids and diabetes.

When to call the emergency number

The answer is simple: at any sudden sign from the FAST test, straight away. It is better to call the emergency number once too often than once too rarely.

Call at once (112, in the US: 911) if one corner of the mouth or one side of the body suddenly becomes weak, speech is suddenly disturbed, or sudden vision, balance or very severe headache problems occur. Even if the symptoms disappear after minutes: do not wait, do not drive yourself, call the emergency number straight away.

After a stroke: stay on top of it with brite

Blood thinners, blood pressure tablets, a statin: after a stroke, several medications often come together. brite helps you keep track of everything.

  • Intake reminders: never miss a tablet, every day at the right time.
  • Readings diary: record your blood pressure and spot changes early.
  • Interaction check: see at a glance whether your medications work well together.
  • Medication plan: always up to date and ready for your next appointment.
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Frequently asked questions

Typical signs are a suddenly drooping corner of the mouth, weakness in one arm and disturbed speech, that is the FAST test. Sudden vision or balance problems and a very severe headache can also occur. At even one sign, call the emergency number at once (112, in the US: 911).

FAST stands for Face, Arms, Speech and Time. If the face droops on one side, one arm drifts down or speech is disturbed, a stroke is likely. Then every minute counts, so call the emergency number at once (112, in the US: 911).

In an infarction (about 85 percent), a clot blocks a vessel. In a bleed (about 15 percent), a vessel bursts. The treatment is opposite, which is why the hospital first uses imaging to find out which form is present.

A TIA is a transient circulation problem in the brain. The symptoms resemble a stroke but usually disappear within minutes to hours. A TIA is a serious warning sign of an impending stroke and must be checked just as urgently.

That depends on the cause. If atrial fibrillation was the trigger, an anticoagulant is used, often a DOAC such as apixaban. If furred-up vessels were the cause, an antiplatelet drug such as ASA or clopidogrel is used. The choice is always made by the doctor.

This varies a great deal. Some people recover fully, others are left with limitations. Early and consistent rehabilitation clearly improves the chances. How much returns depends on the extent and location of the stroke.

The most important lever is well-controlled blood pressure. Beyond that, treating atrial fibrillation, not smoking, regular exercise, a healthy diet and keeping an eye on blood lipids and diabetes all help.

Yes. A stroke is always an emergency that calls for an immediate call to the emergency number (112, in the US: 911), even with only temporary symptoms. The sooner treatment begins, the more brain can be saved.

Related topics

Quellen

  1. DGN, DSG: S2k-Leitlinie „Sekundärprophylaxe ischämischer Schlaganfall und transitorische ischämische Attacke“, Teil 1 (AWMF 030-133) und Teil 2 (AWMF 030-143), Stand 2022 und 2023. register.awmf.org/de/leitlinien/detail/030-133
  2. DGN, DSG: S2e-Leitlinie „Akuttherapie des ischämischen Schlaganfalls“ (AWMF 030-046), Stand 2021. register.awmf.org/de/leitlinien/detail/030-046
  3. Stiftung Deutsche Schlaganfall-Hilfe: Patienteninformationen und FAST-Test. schlaganfall-hilfe.de
  4. IQWiG / gesundheitsinformation.de: Informationen zum Schlaganfall. gesundheitsinformation.de
  5. European Stroke Organisation (ESO): Guidelines. eso-stroke.org
Important note: This article is for general information and does not replace medical advice, diagnosis or treatment. If you suspect a stroke, call the emergency number at once (112, in the US: 911). Which treatment and prevention is right for you should be discussed with a doctor. Last updated: June 2026.