The cerebrum is the largest part of the brain. It is made of a left and a right hemisphere. In most people, the left hemisphere is in charge of the functions on the right-side of the body. It is also involved in abilities such as the ability to speak, or use language.

A left-side stroke happens when the blood supply to the left side of the brain is interrupted. Without oxygen and nutrients from blood, the brain tissue quickly dies.

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There are two main types of stroke: ischemic and hemorrhagic. An ischemic stroke is the most common type of stroke.

An ischemic stroke is caused by a blockage of the blood flow, which may be due to:

  • A clot from another part of the body like the heart or neck. The clot breaks off and flows through the blood until it becomes trapped in a blood vessel supplying the brain.
  • A clot that forms in an artery that supplies blood to the brain.
  • A tear in an artery supplying blood to the brain. Called an arterial dissection.

A hemorrhagic stroke is caused by a burst blood vessel. Blood spills out of the broken blood vessel and pools in the brain. This interrupts the flow of blood and causes a build up of pressure on the brain.

Hemorrhagic vs. Ischemic Stroke
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