Facial drooping is another important warning sign.

A person experiencing a stroke may suddenly notice that one side of their face appears uneven.

Their smile may become crooked, one corner of the mouth may droop, or one eyelid or cheek may appear different from the other.

This occurs when the brain regions responsible for controlling facial muscles are affected.

You can check for this symptom by asking the person to smile.

If one side of the face does not move normally, treat the situation as a possible stroke.

Facial drooping can sometimes be mistaken for facial nerve conditions, but sudden facial weakness requires urgent medical assessment.

3. Sudden Difficulty Speaking or Understanding Language

A stroke can affect the parts of the brain responsible for speech and language.

Someone who was previously speaking normally may suddenly:

• Slur their words.
• Struggle to pronounce familiar words.
• Speak in confusing sentences.
• Have difficulty finding the right words.
• Become unable to understand simple instructions.
• Experience difficulty reading or writing.

Some people know exactly what they want to say but cannot produce the words.

Others may speak fluently but use incorrect words or struggle to understand what others are saying.

These symptoms can occur when a stroke affects language-processing areas of the brain.

If someone suddenly develops speech difficulties, do not assume they are tired, confused, or simply having trouble concentrating.

Call emergency services immediately.

4. Sudden Loss of Vision or Blurred Vision

Changes in vision can sometimes be an early symptom of a stroke.

A person may suddenly experience:

• Blurred vision.
• Double vision.
• Partial loss of vision.
• Difficulty seeing objects on one side.
• Temporary blindness in one eye.

These symptoms occur because the brain regions responsible for processing visual information or the blood vessels supplying them may be affected.

Some people describe the experience as a dark curtain appearing over part of their vision.

Sudden vision loss should never be ignored, even if it improves after a few minutes.

It may indicate a stroke or a transient ischemic attack, commonly known as a TIA.

Both require urgent medical evaluation.

5. Sudden Severe Headache

A sudden, extremely severe headache can sometimes indicate a serious type of stroke, particularly a hemorrhagic stroke.

Unlike an ordinary headache that develops gradually, this headache may appear abruptly and become intense within seconds or minutes.

Some people describe it as the worst headache they have ever experienced.

It may be accompanied by:

• Nausea.
• Vomiting.
• Neck stiffness.
• Sensitivity to light.
• Confusion.
• Loss of consciousness.

A sudden thunderclap headache is a medical emergency because it can indicate bleeding in or around the brain.

Not every severe headache is caused by a stroke, but sudden and unusually intense headaches should receive immediate medical attention.

6. Sudden Dizziness or Loss of Balance

A stroke affecting certain parts of the brain, particularly the cerebellum or brainstem, can interfere with balance and coordination.

A person may suddenly feel as though the room is spinning or that the ground is moving beneath their feet.

They may struggle to stand, walk straight, or coordinate their movements.

Other possible symptoms include:

• Sudden difficulty walking.
• Loss of coordination.
• Unexplained falls.
• Severe dizziness.
• Difficulty controlling body movements.

Although dizziness has many possible causes, sudden severe dizziness combined with difficulty walking, double vision, weakness, or speech problems can indicate a stroke.

Do not dismiss these symptoms as ordinary fatigue.

7. Sudden Confusion or Difficulty Understanding Others

A stroke can affect thinking, memory, attention, and the ability to process information.

Someone experiencing a stroke may suddenly appear confused or behave unusually.

They might struggle to understand familiar instructions, become disoriented, or have difficulty recognizing what is happening around them.

For example, a person may suddenly be unable to understand a simple question or respond appropriately during a conversation.

Confusion can also occur with other serious medical conditions, including low blood sugar and infections.

However, sudden unexplained confusion, particularly when accompanied by other neurological symptoms, requires immediate medical attention.

8. Difficulty Swallowing

Sudden difficulty swallowing, known medically as dysphagia, can occur when a stroke affects the brain areas responsible for coordinating the muscles involved in swallowing.

A person may:

• Cough when drinking water.
• Choke while eating.
• Feel that food is getting stuck.
• Struggle to swallow saliva.
• Develop a wet or unusual voice after drinking.

Swallowing difficulties are particularly concerning because food or liquid can enter the lungs instead of the stomach.

This can cause aspiration and potentially serious complications.

If a stroke is suspected, do not give the person food, water, or medication by mouth.

Wait for medical professionals to assess their swallowing ability.

9. Sudden Nausea or Vomiting With Other Neurological Symptoms

Nausea and vomiting are not specific signs of stroke.

They can occur for many reasons, including digestive problems, infections, migraines, and other conditions.

However, sudden nausea or vomiting accompanied by severe dizziness, loss of balance, double vision, or a severe headache may indicate a neurological emergency.

Certain strokes affecting the brainstem or cerebellum can produce these symptoms.

The combination of symptoms is particularly important.

If someone suddenly becomes unable to walk normally and begins vomiting while experiencing neurological changes, seek emergency medical assistance immediately.

10. Temporary Symptoms That Suddenly Disappear

One of the most dangerous misconceptions about stroke symptoms is believing that they are harmless if they disappear.

Some people experience temporary neurological symptoms that improve within minutes.

This may indicate a transient ischemic attack, commonly called a TIA or mini-stroke.

A TIA happens when blood flow to part of the brain is temporarily interrupted.

Symptoms may include:

• Temporary weakness in an arm or leg.
• Brief facial drooping.
• Temporary difficulty speaking.
• Sudden vision loss.
• Temporary balance problems.
• Sudden numbness.

Although symptoms may disappear completely, a TIA is a serious warning that a future stroke may occur.

It is impossible to determine safely at home whether symptoms represent a TIA or a completed stroke.

Anyone experiencing possible TIA symptoms needs immediate emergency medical evaluation, even if they feel completely normal afterward.

The FAST Method: A Simple Way to Recognize a Stroke