My iPhone 4s isn't showing iMessages as read?

All of a sudden my iPhone isn't showing received messages as being read. I've clearly read and replied to them, but my iMessage app is still telling me I have unread messages. It's just going up and up. I tried turning my phone off and on again, but all that did was clear the iMessage history on one of my contacts. The number is now stuck at 34 unread messages.

It's an iPhone 4s and I updated to iOS 7 a while back. This problem just started today - any clues on how to fix this?

Maybe who your sending your message to has set there imessage to not say read. You can access that in your settings.

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