Sudden blurred vision, double vision, or loss of sight.
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### F — Face
One side of the face becomes weak or droops.
### A — Arms
One arm becomes weak or numb.
### S — Speech
Speech becomes slurred, strange, or difficult to understand.
### T — Time
Call emergency medical services immediately.
## Why Every Minute Matters
A stroke interrupts the brain’s blood supply. Without oxygen and nutrients, brain cells can begin to die within minutes.
Fast treatment can reduce brain damage and improve the likelihood of recovery. Some treatments are particularly time-sensitive, which is why waiting to see whether symptoms disappear can be dangerous.
## What If the Symptoms Disappear?
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A stroke can suddenly weaken one side of the face.
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Ask the person to smile. Warning signs include:
* One side of the mouth drooping
* An uneven smile
* Facial numbness
* Difficulty controlling one side of the face
Facial drooping is one of the key signs in the B.E. F.A.S.T. stroke-recognition method.
## 3. Sudden Trouble Speaking
Stroke can affect the parts of the brain responsible for language.
A person may suddenly:
* Slur their speech
* Use incorrect words
* Struggle to speak
* Be difficult to understand
* Have trouble understanding what others are saying
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Ask the person to repeat a simple sentence. If their speech is suddenly abnormal, seek emergency help.
## 4. Sudden Vision Changes
Stroke can interfere with vision in one or both eyes.
Possible symptoms include:
* Blurred vision
* Double vision
* Sudden partial vision loss
* Sudden loss of sight
* Difficulty focusing
Sudden eye or vision changes are included in the American Stroke Association’s B.E. F.A.S.T. warning signs.
## 5. Sudden Dizziness or Loss of Balance
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Some strokes affect areas of the brain involved in balance and coordination.
A person may suddenly experience:
* Severe dizziness
* Trouble standing
* Difficulty walking
* Poor coordination
* Loss of balance
These symptoms become particularly concerning when they occur with weakness, speech problems, or vision changes.
## 6. A Sudden Severe Headache
A severe headache that begins unexpectedly and has no obvious cause can sometimes occur during a stroke.
It may be especially concerning if accompanied by:
* Vomiting
* Confusion
* Weakness
* Vision problems
* Difficulty speaking
The American Stroke Association lists sudden severe headache without a known cause among additional stroke warning signs.
## 7. Sudden Confusion
A stroke can cause an abrupt change in thinking or understanding.
Someone may:
* Seem disoriented
* Struggle to understand simple questions
* Give inappropriate answers
* Suddenly have trouble following a conversation
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Sudden confusion or difficulty understanding speech is a recognized warning symptom.
## 8. Sudden Nausea or Vomiting With Neurological Symptoms
Nausea and vomiting alone are not classic signs of stroke and can happen for many reasons.
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However, they may occur during certain strokes, particularly when areas involved in balance and coordination are affected. The American Stroke Association notes that strokes involving the cerebellum can produce dizziness, balance problems, nausea, or vomiting.
Nausea becomes more concerning when it appears suddenly together with:
* Severe dizziness
* Loss of balance
* Vision problems
* Weakness
* Speech difficulty
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## What About Difficulty Breathing?
Breathing difficulty is **not one of the standard B.E. F.A.S.T. stroke warning signs**.
However, certain brain-stem strokes can affect automatic body functions, including breathing.
Sudden severe breathing difficulty is always a medical emergency regardless of its cause and should never be ignored.
## Remember B.E. F.A.S.T.
The American Stroke Association recommends remembering these six letters:
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### B — Balance
Sudden loss of balance, coordination, or ability to walk normally.
E — Eyes
Sudden blurred vision, double vision, or loss of sight.
### F — Face
One side of the face becomes weak or droops.
### A — Arms
One arm becomes weak or numb.
### S — Speech
disappear can be dangerous.
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## What If the Symptoms Disappear?
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Do not assume everything is fine.
Temporary stroke-like symptoms may represent a **transient ischemic attack (TIA)**, sometimes called a warning stroke.
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The American Stroke Association reports that TIAs occur before roughly 15% of strokes and can be followed by another TIA, stroke, or cardiovascular event within days or weeks. Emergency evaluation is recommended even if the symptoms disappear.
## What Should You Do If You Suspect a Stroke?
If stroke symptoms appear:
Several factors can increase stroke risk, including:
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* High blood pressure
* Atrial fibrillation
* High cholesterol
* Diabetes
* Smoking or tobacco use
* Obesity
* Physical inactivity
* Previous TIA or stroke
* Family history of stroke
Managing these risk factors can substantially reduce the likelihood of stroke.
## The Bottom Line
A stroke usually does not provide a predictable advance warning.
Instead, the key is recognizing **sudden changes**: balance problems, vision loss, facial drooping, arm weakness, speech difficulty, numbness, confusion, or an unexplained severe headache.
If any of these symptoms appear, do not wait for all of them to occur and do not wait for them to disappear.
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**B.E. F.A.S.T. and seek emergency medical help immediately.** Fast action can protect brain tissue, reduce disability, and save a life.