Transient ischemic attack (TIA) is a temporary interruption of the blood flow to an area of the brain. TIAs are a warning sign that a stroke may soon follow.

A clot in an artery, a drop in blood pressure, or a change in heart rhythm or rate may all reduce blood flow to the brain and result in a TIA.

Symptoms of a TIA are similar to those of a stroke. They may include:

• Vision problems.
• Difficulty speaking, or unusual behavior and thought processes.
• Difficulty understanding words.
• Loss of consciousness.
• Seizures.
• Dizziness (vertigo) or trouble walking.
• Weakness or numbness on one side of the body.

Unlike a stroke, a TIA does not cause lasting symptoms. Symptoms usually go away after 10 to 20 minutes.

A TIA is considered a warning sign of an impending stroke.