A “mini-stroke,” medically known as a **transient ischemic attack (TIA)**, can be easy to miss because symptoms may disappear within minutes or hours.
But temporary symptoms do **not** mean the episode was harmless.
A TIA happens when blood flow to part of the brain is temporarily blocked. Its symptoms are essentially the same as those of a stroke, and the American Stroke Association describes a TIA as a **“warning stroke”** because it can signal a higher risk of a full stroke afterward.
If sudden neurological symptoms appear, emergency medical assessment is needed even if the person feels completely normal again afterward.
# 1. Sudden Weakness on One Side
One of the most important warning signs is sudden weakness affecting the:
* Face
* Arm
* Hand
* Leg
It typically occurs on one side of the body.
A person may suddenly be unable to grip normally, lift one arm, or walk steadily. The weakness may disappear quickly during a TIA, which is why some people mistakenly ignore it.
Ask the person to raise both arms. If one arm drifts downward or cannot be lifted normally, seek emergency help.
## 2. Numbness or Loss of Sensation
Sudden numbness can occur with or without obvious weakness.
It may feel like:
* Pins and needles
* Loss of sensation
* A strange heavy feeling
* Numbness of one side of the face
* A numb arm or leg
Sudden one-sided numbness is a recognized symptom of both stroke and TIA.
Do not assume it is simply caused by sleeping in an awkward position if it appears suddenly without a clear explanation.
## 3. Facial Drooping
A TIA can temporarily weaken the muscles on one side of the face.
You may notice that:
* One corner of the mouth droops
* The smile becomes uneven
* One eye or side of the face appears lower
* The person says their face feels numb
The **F in FAST** stands for Face because facial drooping is one of the classic warning signs.
Ask the person to smile. If one side does not move normally, treat it as an emergency.
## 4. Trouble Speaking or Understanding Words
A TIA can temporarily affect the areas of the brain responsible for language.
Someone may suddenly:
* Slur words
* Speak strangely
* Struggle to find simple words
* Say sentences that do not make sense
* Be unable to understand what others are saying
Speech difficulty is one of the central FAST warning signs.
Ask the person to repeat a simple sentence. Any sudden abnormal speech should be taken seriously.
## 5. Sudden Vision Problems
Temporary vision changes are another possible sign.
Symptoms can include:
* Blurred vision
* Double vision
* Partial loss of sight
* Complete loss of vision in one eye
* Sudden difficulty seeing in both eyes
The American Stroke Association includes sudden blindness or vision changes among TIA warning signs.
Because the symptom may disappear quickly, a person might assume that their eyes were simply tired. But a sudden unexplained visual change needs urgent assessment.
## 6. Sudden Dizziness or Vertigo
A TIA can affect areas of the brain responsible for balance and coordination.
Possible symptoms include:
* Sudden dizziness
* A spinning sensation
* Difficulty standing
* Feeling pulled to one side
* Sudden instability while walking
Dizziness alone is very common and can have many harmless causes.
But sudden dizziness combined with weakness, speech difficulty, visual changes, or loss of coordination is much more concerning.
## 7. Loss of Balance or Coordination
Some people suddenly become unable to move normally.
