A stroke occurs when blood flow to the brain is interrupted. When a stroke occurs, brain cells in the immediate area begin to die because they stop getting the oxygen and nutrients they need to function. Stroke can cause a loss of the ability to speak, memory problems, or paralysis on one side of the body. Getting the right care at the right time can help reduce the risk of complication and another stroke. The measures reported in this section show some of the standards of stroke care that Brigham and Women’s Hospital follows, for adults who have had a stroke.