Warning signs are clues your body sends that your brain is not receiving enough oxygen. If you observe one or more of these signs of a stroke or brain attack, don t wait, call a doctor or 911 right away! -Sudden numbness or weakness of face, arm or leg, especially on one side of the body -Sudden confusion, trouble speaking or understanding -Sudden trouble seeing in one or both eyes -Sudden trouble walking, dizziness, loss of balance or coordination -Sudden severe headache with no known cause Other danger signs that may occur include double vision, drowsiness, and nausea or vomiting. Sometimes the warning signs may last only a few moments and then disappear. These brief episodes, known as transient ischemic attacks or TIAs, are sometimes called mini-strokes. Although brief, they identify an underlying serious condition that isn t going away without medical help. Unfortunately, since they clear up, many people ignore them. Don t. Heeding them can save your life.