Links within an iPhone app

Imagine an iPhone app with a tab bar (5 items) and a link to the user's profile in the header.

Now let's say that you're somewhere in tab 5 and you'd like to make a link to a screen within the user's profile.

I feel like this is not a good practice. An app isn't quite like a website and there aren't usually links from a tab to another.

Do you know a way around this? Or do you have any explanation on why this is not a good practice within an app?

The one solution I can think about is to bring up the screen in a modal view but this doesn't really work for me here.