Most TIAs (transient ischemic attacks) last less than five minutes. Symptoms resolve on their own, typically within an hour, though in rare cases they can persist for up to 24 hours. Despite the short duration, a TIA is a medical emergency because it signals a significantly elevated risk of a full stroke in the hours and days that follow.
Why Symptoms Are So Brief
A TIA happens when a blood clot temporarily blocks an artery supplying the brain. Unlike a full stroke, the clot dissolves on its own or gets pushed along by blood flow before it causes permanent damage. Once blood flow is restored, neurological symptoms fade. The whole episode can be over in under a minute or stretch to several minutes, but the vast majority resolve within five minutes.
If symptoms last longer than 24 hours, it’s no longer classified as a TIA. That’s a stroke, even if symptoms eventually improve.
What It Feels Like
TIA symptoms come on suddenly and mirror those of a stroke. They can include:
- Weakness or numbness on one side of the body, often the face, arm, or leg
- Slurred speech or difficulty understanding what someone is saying
- Vision changes such as blindness in one or both eyes, or double vision
- Dizziness, loss of balance, or coordination problems
- Confusion that appears without explanation
Because these symptoms disappear quickly, many people dismiss them or decide not to seek care. That instinct is dangerous. You cannot tell the difference between a TIA and a stroke while it’s happening, and the risk of a full stroke spikes immediately afterward.
Stroke Risk After a TIA
The most important thing to understand about a TIA is what comes next. The short-term risk of a full ischemic stroke is roughly 3% to 10% within the first 48 hours. At seven days, the risk sits around 5%. Over 90 days, it climbs to 9% to 17%. Those numbers may sound modest, but a stroke within two days of a warning event is a preventable catastrophe if you’ve already sought treatment.
The first 48 hours represent the highest-danger window. That’s why emergency evaluation matters even when your symptoms have completely cleared. Imaging can reveal whether you have a narrowed artery, a heart rhythm problem, or another treatable cause that makes a second event more likely. Treatment started quickly, such as blood thinners or blood pressure management, can dramatically reduce that follow-up stroke risk.
Cognitive Effects That Can Linger
The word “transient” suggests everything goes back to normal, and physically it usually does. But research published in the journal Stroke found that more than 35% of TIA patients showed measurable impairment in at least one area of thinking within three months of the event. Working memory was affected in about 25% of patients, attention in 22%, and information processing speed in 16%. These rates were significantly higher than in people of the same age who hadn’t experienced a TIA.
The subtle nature of these changes is part of the problem. In the same study, patients reported similar rates of everyday cognitive complaints as the control group, suggesting the difficulties are real but not always obvious in daily life. You might find yourself a bit slower to process new information or more easily distracted without connecting it to the TIA. These effects fit a pattern researchers associate with vascular cognitive impairment, where reduced blood flow to the brain creates low-grade but measurable deficits.
What Happens at the Hospital
If you arrive at the emergency department with TIA symptoms that have already resolved, you’ll still undergo a workup. This typically includes brain imaging to rule out a stroke that might look like a TIA, imaging of the blood vessels in your neck and head, heart monitoring to check for irregular rhythms, and blood tests. The goal is to find the underlying cause so it can be treated before a full stroke occurs.
Most people don’t need to stay in the hospital overnight. If your imaging is reassuring and you’re medically stable, you’ll likely be sent home with a treatment plan and close follow-up. People who are medically unstable or who have high-risk features on their workup are more likely to be admitted for observation.
Why You Shouldn’t Wait It Out
The most common mistake with a TIA is treating it as a close call that worked out. Because symptoms vanish, it feels like nothing happened. In reality, a TIA is your brain’s clearest possible warning that a stroke mechanism is active. The clot that dissolved this time may not dissolve next time. Getting evaluated quickly, ideally within hours, gives you the best chance of identifying and fixing the problem before it causes lasting damage.