SOPA Images/ShutterstockHave you ever logged into Yahoo Mail on this device before? If not, there might be an issue.
If it's a new computer or mobile device, and you're using Yahoo Mail on it for the first time, you'll be asked to verify your information. If you've made too many unsuccessful login attempts, your account may lock for 12 hours before you're allowed to sign in again.
If you're worried that your account may have been hacked, select the "Forgot Password" option and change your password immediately.