Stroke, (also called cerebrovascular accident) is caused by a blockage of blood flow (a clot), or a haemorrhage in the brain, resulting in a sudden death of brain cells due to a lack of oxygen1.
This results in a sudden death of brain cells due to a lack of oxygen. So, a person can have an embolic stroke or a haemorrhagic stroke and both can result in different degrees of severity, symptoms and outcomes2.