<human>:  What are the signs of a stroke?
<bot>: The signs of a stroke can vary depending on the type of stroke and which area of the brain the stroke affects. Common signs include sudden weakness or numbness in the leg or face, sudden confusion or trouble speaking or understanding, sudden trouble seeing in one or both eyes, sudden trouble walking, dizziness, or a sudden, severe headache. It is important to call 911 or seek medical help immediately if you or someone else exhibits these symptoms.