Can You Have a Stroke and Not Know It?

Strokes can cause sudden, dramatic symptoms. But they can also occur with subtle or even unnoticed symptoms. These so-called "silent strokes" can still cause lasting damage, and it’s crucial to understand risk factors and key signs. Chief, Division of Stroke & Cerebrovascular Neurosurgery and Vice Chair of Regional Neurosurgery at UR Medicine, Tarun Bhalla, MD, PhD, shares what you need to know about stroke detection and treatment.

What Is a Stroke?

A stroke occurs when blood flow to part of the brain is interrupted—either by a blockage (ischemic stroke) or bleeding (hemorrhagic stroke). Without oxygen and nutrients, brain cells start to die within minutes.

There are two main types:

• Ischemic stroke – Caused by a blood clot or blocked artery.
• Hemorrhagic stroke – Caused by a ruptured blood vessel in the brain.

Both require immediate medical attention to prevent permanent damage or death.

Can You Have a Stroke and Not Know It?

Yes, many people suffer what’s known as a silent stroke—a stroke with no obvious symptoms. These are often discovered later through brain imaging done for unrelated reasons.

Another condition called a Transient Ischemic Attack (TIA), or "mini-stroke," causes temporary stroke symptoms that resolve within minutes or hours. While they don’t leave permanent damage, TIAs are a red flag that a major stroke may occur in the future.

How to Recognize the Early Symptoms of a Stroke | FAST Test

Recognizing stroke symptoms early can save a life. Use the F.A.S.T. method:

• Face drooping – One side of the face may droop or feel numb.
• Arm weakness – Inability to lift one arm or sudden numbness.
• Speech difficulty – Slurred or garbled speech.
• Time to call 911 – Seek emergency help immediately.

Other signs of stroke include:

• Sudden numbness or weakness (especially on one side of the body)
• Confusion or trouble speaking
• Blurred or double vision
• Difficulty walking, dizziness, or loss of balance
• Sudden severe headache with no known cause

Stroke Symptoms in Women vs. Men

Stroke symptoms in women may include additional or atypical signs, which can make them harder to recognize:

• General weakness or fatigue
• Nausea or vomiting
• Fainting or confusion
• Sudden behavioral changes

Conditions That Can Mimic a Stroke

Not everything that looks like a stroke is a stroke. These conditions may show similar symptoms:

• Migraine with aura – Visual changes or numbness
• Seizures – Post-seizure weakness or confusion
• Bell’s palsy – Facial drooping, but not caused by stroke
• Low blood sugar (hypoglycemia) – Can cause slurred speech and dizziness

What to Do if You Think Someone Is Having a Stroke

If you suspect a stroke:

• Call 911 immediately.
• Note the time symptoms began—treatment decisions depend on this.
• Do not drive yourself or the patient to the hospital.

Do Strokes Always Cause Pain?

Not always. Most strokes, especially ischemic strokes, are not painful. Some patients experience only functional symptoms—such as weakness, slurred speech, or confusion—without discomfort. This can delay recognition and treatment.

Who’s at Risk for Stroke?

Anyone can have a stroke, but these risk factors significantly increase your chances:

Even young adults and people in good health can experience a stroke, especially if risk factors are overlooked.

Whether it’s a silent stroke or a mini-stroke, recognizing even mild or temporary symptoms can make a life-saving difference.