There are two main types of stroke, ischemic stroke and hemorrhagic stroke, and each has its own set of causes.
Ischemic stroke |
Ischemic stroke occurs when a blood clot or debris blocks an artery that provides blood to the brain, causing brain cells to die. The most common cause of ischemic stroke is atherosclerosis, which occurs when plaque builds up in the blood vessels over time, narrowing and hardening the arteries. Other potential causes of ischemic stroke include a blood clot that forms in another part of the body and travels to the brain, known as an embolism, and a condition called cerebral small vessel disease, which damages the small blood vessels in the brain.
Hemhemorrhagic stroke |
Hemorrhagic stroke happens when a blood vessel breaks and blood spills into the brain tissue, damaging brain cells. Hemorrhagic strokes account for roughly 15% of all strokes and are usually more severe than ischemic strokes. There are two types of hemorrhagic stroke: intracerebral hemorrhage and subarachnoid hemorrhage. Intracerebral hemorrhages occur when a blood vessel ruptures within the brain, usually resulting from high blood pressure or head trauma. Subarachnoid hemorrhages happen when a blood vessel ruptures outside the brain, usually caused by a ruptured aneurysm or arteriovenous malformation (AVM).
Other less common types of stroke include transient ischemic attack (TIA), also known as a "mini-stroke," and cryptogenic stroke. TIAs are brief episodes of stroke-like symptoms that typically last less than an hour and are caused by temporary blood flow problems in the brain. Cryptogenic strokes occur when a cause cannot be identified, despite tests and examinations.
In conclusion, the two main types of stroke are ischemic and hemorrhagic. Ischemic strokes are typically caused by blockages or narrowed blood vessels in the brain, while hemorrhagic strokes result from ruptured or burst blood vessels in the brain. Other less common types of stroke include TIA and cryptogenic stroke. Understanding the different types and their causes can help individuals take preventative measures to decrease their risk of experiencing a stroke.