Why can't I download an app on iOS 7?

I'm trying to download a free app from the app store on iOS 7 but it doesn't seem to be working. I tapped the install button but a blue circle just spins and nothing happens. This has never happened before, it usually spins for a second, asks me for my fingerprint, and then continues spinning until it's downloaded. I'm using a 16 GB iPhone 5s running iOS 7.

Added (1). I tried that and it worked, thank you. Not sure why I didn't think of that before. I appreciate the help.

Reboot your phone and try again.

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