A stroke occurs when the blood supply to a part of the brain is interrupted or reduced, depriving brain tissue of oxygen and nutrients. This can happen due to a blockage in an artery leading to the brain (ischemic stroke) or a rupture of a blood vessel in the brain (hemorrhagic stroke).

Ischemic stroke is caused by a blockage in an artery leading to the brain, while hemorrhagic stroke is caused by a rupture of a blood vessel in the brain.

A transient ischemic attack (TIA) is a temporary interruption of blood flow to the brain, which usually lasts for less than 5 minutes. TIAs are often a warning sign that a stroke may occur in the future.

Common symptoms of a stroke include sudden weakness or numbness on one side of the body, sudden difficulty speaking or understanding speech, sudden vision problems in one or both eyes, and sudden dizziness, loss of balance, or coordination problems.

The FAST test is a simple test that can help identify the signs of a stroke. FAST stands for Face, Arm, Speech, and Time. If you suspect someone is having a stroke, ask them to smile, raise both arms, and repeat a simple sentence. If they have difficulty doing any of these things, call 911 immediately.

Large artery stroke is the most common type of ischemic stroke, accounting for about 50% of all strokes. It occurs when a large artery leading to the brain becomes blocked, usually by a blood clot.

Hypertension, or high blood pressure, is the most common cause of hemorrhagic stroke, accounting for about 80% of cases. Hypertension can weaken the blood vessels in the brain, making them more likely to rupture.

Risk factors for stroke include high blood pressure, high cholesterol, diabetes, smoking, obesity, physical inactivity, excessive alcohol consumption, and atrial fibrillation.

The long-term effects of a stroke can vary depending on the severity of the stroke and the part of the brain that was affected. Common long-term effects include paralysis, aphasia (difficulty speaking or understanding speech), cognitive impairment (difficulty with memory, attention, and problem-solving), and emotional problems (such as depression and anxiety).

Treatment for a stroke depends on the type of stroke and the severity of the symptoms. Treatment options may include thrombolytic therapy (to dissolve a blood clot), endovascular therapy (to remove a blood clot or repair a damaged blood vessel), surgery (to remove a blood clot or repair a damaged blood vessel), and rehabilitation (to help improve function and independence).

To prevent a stroke, it is important to control blood pressure, lower cholesterol, manage diabetes, quit smoking, maintain a healthy weight, get regular exercise, limit alcohol consumption, and manage atrial fibrillation.

If you suspect someone is having a stroke, you should call 911 immediately. The sooner treatment is started, the better the chances of a good recovery.

Heart disease is the leading cause of death in the United States, followed by cancer, stroke, and chronic lower respiratory disease.

About 795,000 people in the United States have a stroke each year.

The average age of a person who has a stroke is 65 years.