What is a stroke?

What is a Stroke?

　Stroke is a disease in which nerve cells are damaged when blood fails to reach the brain due to a ruptured or blocked blood vessel in the brain. It can be categorized into several conditions based on its cause. This section will introduce three of the most common types.

①Cerebral Infarction

Cerebral infarction is a disease in which a blood vessel in the brain becomes blocked, resulting in a lack of blood flow to the brain and causing damage. Symptoms typically include motor paralysis on one side of the body, difficulty speaking, and impaired consciousness. Compared to the other two types, it carries a higher risk of severe complications and lasting sequelae. It accounts for a staggering three-quarters of all strokes.

②Cerebral Hemorrhage

Cerebral hemorrhage is a disease that occurs when a blood vessel in the brain ruptures, causing bleeding within the brain, and the resulting blood clot damages brain cells. Various symptoms can be observed, such as sudden headaches, speech impairment, and motor paralysis. The severity also varies greatly; it can range from mild numbness to permanent limb disability, and in some cases, it can even be a fatal disease.

③Subarachnoid Hemorrhage

Subarachnoid hemorrhage is a disease caused by bleeding in the space between the arachnoid membrane and the pia mater of the brain. The majority of cases are caused by the rupture of an aneurysm, and it is more common in women than men, tending to increase with age. This disease also causes a variety of symptoms, such as sudden severe headaches, vomiting, loss of consciousness, and paralysis of the limbs.