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Stroke Diagnosis

Types of Stroke

There are two types of stroke — ischemic stroke and hemorrhagic stroke — and they occur when blood supply to the brain is interrupted. 

  • During an ischemic stroke, which accounts for about 87 percent of all strokes, the interruption is caused by a blood clot or gradual accumulation of plaque and other fatty deposits in arteries serving the brain.
  • A hemorrhagic stroke occurs when a blood vessel in the brain breaks, leaking blood into the brain.

In either type of stroke, if blood flow is interrupted for more than a few seconds, the oxygen-deprived brain cells begin to die. Without fast and effective stroke treatment, this can lead to loss of abilities—such as memory, movement and speech—that are controlled by that area of the brain. Learn the warning signs of stroke.