smile looks uneven or one side does not move normally, emergency medical care is needed.
## 4. Difficulty Speaking
Stroke can affect parts of the brain responsible for language.
A person may suddenly:
* Slur their words
* Struggle to form sentences
* Use inappropriate words
* Be unable to speak
* Have difficulty understanding what others are saying
Ask the person to repeat a simple sentence.
If their speech sounds strange or they cannot repeat it correctly, treat the situation as an emergency.
## 5. Sudden Vision Changes
Stroke can interfere with the parts of the brain responsible for vision.
Possible symptoms include:
* Blurred vision
* Double
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