| • | Stroke Overview
A stroke is an illness that suddenly disrupts the brain's function by interfering with part of its blood supply. |
| • | Hemorrhagic Stroke
A hemorrhagic stroke is bleeding (hemorrhage) that suddenly interferes with the brain's function by cutting off part of its blood supply. |
| • | Lacunar Stroke
A lacunar stroke is a blockage of blood flow to a part of the brain supplied by one of the brain's smaller penetrating arteries. |
| • | Subarachnoid Hemorrhage
A subarachnoid hemorrhage is bleeding from a damaged artery at the surface of the brain. This bleeding often causes a sudden, severe headache. It is a medical emergency. |
| • | Thrombotic Stroke
In a thrombotic stroke, a blood clot (thrombus) forms inside one of the brain's arteries and blocks blood flow to a part of the brain. |
| • | Transient Ischemic Attack (TIA)
A transient ischemic attack (TIA) is an episode of strokelike symptoms that lasts less than 24 hours (usually 5 to 20 minutes). |
