A transient ischemic attack (TIA) causes stroke-like symptoms that appear suddenly and then disappear, usually within minutes. Because the symptoms resolve on their own, many people aren’t sure whether what they experienced was a TIA or something else entirely. The key features are sudden neurological symptoms, like weakness on one side of the body or trouble speaking, that came on without warning and went away completely. If that sounds like what happened to you, getting evaluated quickly matters: roughly 6% to 9% of people who have a TIA go on to have a full stroke within 90 days.
The Hallmark Symptoms of a TIA
TIA symptoms mirror those of a stroke. The difference is that they’re temporary. They hit suddenly and typically last seconds to minutes, rarely exceeding an hour. The most common signs include:
- Weakness or numbness on one side of the body, particularly in the face, arm, or leg
- Slurred speech or difficulty understanding what others are saying
- Vision changes, such as blindness in one or both eyes or double vision
- Dizziness, loss of balance, or coordination problems that appear out of nowhere
- Confusion that you can’t explain by fatigue, medication, or anything else obvious
Two details set TIA apart from other causes of these symptoms. First, TIA symptoms appear all at once. You don’t feel a tingle that slowly builds over 15 minutes into numbness. It’s more like flipping a switch. Second, if you experienced multiple symptoms, they likely happened at the same time rather than one after another in sequence.
How a TIA Feels Different From a Migraine
Migraine with aura is one of the most common conditions confused with TIA, especially when it causes numbness, vision loss, or trouble finding words. The distinction comes down to timing and progression.
Migraine aura symptoms build gradually, usually over 5 to 20 minutes, and each individual symptom lasts up to 60 minutes. They also tend to produce “positive” neurological effects first, like seeing flashing lights, shimmering lines, or feeling tingling sensations, before any loss of function (like a blind spot or numbness) sets in. A TIA, by contrast, starts abruptly with “negative” symptoms: sudden loss of vision, sudden numbness, sudden inability to speak. There’s no slow buildup.
Migraine aura symptoms also tend to march in a sequence. You might see visual disturbances first, then develop tingling in your hand that creeps up your arm. With a TIA, everything that’s going to happen tends to happen at once. One important red flag: if you experienced weakness on one side of your body or lost vision in only one eye, those point more strongly toward TIA than migraine and should always be evaluated.
Why Symptoms Disappear Doesn’t Mean It’s Harmless
The “transient” in TIA means the blood supply to part of your brain was temporarily cut off, usually by a small clot, but flow resumed before permanent damage occurred. The fact that your symptoms resolved is good news in the short term. But it signals that something in your vascular system created a clot once and can do it again.
The 90-day stroke risk after a TIA sits between 6% and 9%, with the highest danger concentrated in the first few days. Certain factors push that risk higher: being over 60, having high blood pressure at the time of the event, experiencing weakness on one side of your body (rather than only sensory changes), having symptoms that lasted longer than 10 minutes, and having diabetes. The more of these that apply to you, the more urgent evaluation becomes.
What Happens When You Get Evaluated
If you think you had a TIA, even if your symptoms have completely resolved, getting to an emergency department is the right move. The workup focuses on two questions: did a clot actually block blood flow to your brain, and what caused it?
The most important test is an MRI with a specialized technique called diffusion-weighted imaging. This scan can detect even tiny areas of brain tissue that were starved of blood. About 40% of people who come in with TIA symptoms actually show a positive finding on this scan, meaning they had a small stroke rather than a true TIA. That distinction matters because it means a higher risk of another event: people with a positive finding have more than six times the risk of a recurrent stroke within a year compared to those with a clean scan. Ideally, the MRI happens within 24 hours of symptom onset, since the scan becomes less reliable the longer you wait.
You’ll also likely get imaging of the blood vessels in your neck. The carotid arteries supply blood to your brain, and significant narrowing from plaque buildup is a treatable cause of TIA. An ultrasound of these arteries is a common screening tool, though it’s sometimes done during an observation stay rather than in the emergency department itself. Blood tests for cholesterol, blood sugar, and clotting factors round out the picture, along with heart monitoring to check for irregular rhythms that can send clots to the brain.
Signs It Probably Wasn’t a TIA
Not every episode of dizziness, confusion, or visual weirdness is a TIA. Several features make a TIA less likely. If your symptoms came on gradually over many minutes, if they were accompanied by a headache (especially one that felt like a migraine you’ve had before), or if they involved “positive” phenomena like flashing lights, zigzag lines, or pins-and-needles tingling that spread slowly across your body, a migraine aura is a more likely explanation.
Sudden low blood sugar can cause confusion, weakness, and dizziness that resolves once you eat. Seizures can produce temporary neurological symptoms followed by a recovery period. Anxiety and panic attacks can cause numbness in both hands, lightheadedness, and a feeling that something is very wrong. None of these involve a blocked blood vessel in the brain.
The pattern that should concern you most is sudden onset of one-sided symptoms. Numbness in your left hand and the left side of your face at the same time, trouble getting words out, vision going dark in one eye, or sudden loss of balance with any of the above. These are the combinations that point toward a vascular event in the brain rather than something else.
What Treatment Looks Like After a TIA
If you’re diagnosed with a TIA, the goal shifts immediately to preventing a full stroke. For most people, this starts with dual antiplatelet therapy, meaning two blood-thinning medications taken together for a short period to reduce the chance of another clot forming. This combination is most effective when started early, within the first day or two.
Beyond medication, the workup results guide what comes next. If significant narrowing is found in a carotid artery, a procedure to open it back up may be recommended. If an irregular heart rhythm is detected, a different type of blood thinner is used long-term. Blood pressure and cholesterol management become priorities regardless of the underlying cause. Many people leave the hospital with new prescriptions and a follow-up plan with a neurologist within a week or two.
The reassuring part: when TIAs are recognized and treated promptly, the risk of a subsequent stroke drops significantly. The dangerous scenario is ignoring the event because the symptoms went away. A TIA is your brain’s warning shot, and acting on it is one of the most effective things you can do to prevent a major stroke.