This disease doesn't just affect your mother or grandmother, but young people as well. Strokes in 20-somethings are often misdiagnosed or not diagnosed at all.
In younger people, stroke can be associated with symptoms such as confusion, delirium, seizures, sudden extreme sleepiness, or nausea and vomiting. In other words, your M.D. may not immediately recognize a stroke as a stroke simply because it manifests differently than it would in your grandmother.