11/19/2025
Ischemic strokes are the most common type of stroke, accounting for about 87% of all strokes. They occur when a blood vessel supplying blood to the brain is obstructed, often by a blood clot. This lack of blood flow (ischemia) leads to the death of brain cells and brain damage.
There are two main types of ischemic strokes: thrombotic and embolic.
- Thrombotic strokes are caused by a thrombus (blood clot) that develops in the arteries supplying blood to the brain. This often happens in arteries that are already narrow due to atherosclerosis.
- Embolic strokes are caused by an embolus (usually a blood clot or a piece of atherosclerotic plaque) that travels from elsewhere in the body through the bloodstream to the brain.
The symptoms of an ischemic stroke can vary depending on the area of the brain that is affected, but they often include sudden numbness or weakness of the face, arm, or leg, especially on one side of the body, confusion, trouble speaking or understanding speech, difficulty seeing in one or both eyes, trouble walking, dizziness, loss of balance or coordination, or severe headache with no known cause.
Treatment for ischemic strokes often involves medications to break down clots and prevent others from forming, and in some cases, a procedure may be needed to remove or break up a clot.