May is National Stroke Month. Learn how to spot a stroke F.A.S.T. Face Drooping. Arm Weakness. Speech Difficulty. Time to ask for help. Other symptoms you should know — sudden numbness or weakness of the leg, sudden confusion or trouble understanding, sudden trouble seeing in one or both eyes, sudden trouble walking, dizziness, loss of balance or loss of coordination, and/or sudden severe headache with no known cause. Stroke is largely a preventable, treatable and beatable disease that affects 795,000 Americans a year.