Transient brain ischemia — often referred to as a "mini-stroke" — may seem harmless because its symptoms are temporary. However, doctors warn that these brief episodes are serious red flags that could signal a much larger stroke is coming.

What Is Transient Brain Ischemia?

Transient brain ischemia, medically known as a Transient Ischemic Attack (TIA), occurs when blood flow to a part of the brain is briefly interrupted. Unlike a full-blown stroke, the blockage usually lasts only a few minutes and resolves on its own without causing permanent damage. But that doesn’t mean it’s harmless.

“A TIA is a warning shot,” says Dr. Nguyen Van Minh, a neurologist. “It’s the brain’s way of saying something is wrong. Ignoring it could lead to a life-threatening stroke.”

Key Warning Signs to Watch For

TIAs can be difficult to recognize because the symptoms disappear quickly, often within an hour. Still, early detection is crucial.

Here are the most common signs:

• Sudden numbness or weakness in the face, arm, or leg, especially on one side of the body

• Difficulty speaking or understanding speech

• Sudden vision problems in one or both eyes

• Dizziness or loss of balance

• Severe headache with no known cause

These symptoms may last only a few minutes, but they must be taken seriously.

Why It’s So Dangerous

While TIAs don’t cause lasting damage, they are often a precursor to a full stroke. Studies show that 1 in 3 people who experience a TIA will have a stroke — often within days or weeks.

“You should treat every TIA as an emergency,” Dr. Minh emphasizes. “Even if you feel fine afterward, your brain has just experienced a major warning.”

What to Do If You Notice Symptoms

If you or someone near you shows signs of a TIA:

1. Call emergency services immediately. Don’t wait for symptoms to disappear.

2. Note the time the symptoms began — this helps doctors determine the best treatment.

3. Avoid driving yourself — have someone else call for help.

Prevention: How to Lower Your Risk

Doctors recommend the following steps to reduce the chance of a TIA or stroke:

• Control blood pressure and cholesterol

• Manage diabetes

• Quit smoking

• Eat a healthy diet rich in fruits, vegetables, and whole grains

• Exercise regularly

• Limit alcohol and avoid illicit drugs