alias command stopped working

I have a few aliases set up on my mac. But for some reason they don't seem to work anymore. I'm not sure why either. Even when I type in alias to see my list of aliases nothing happens just this:

Jonnys-MacBook-Air:~ jonny$ alias
Jonnys-MacBook-Air:~ jonny$ 

If I go into my ~/.profile script with nano I can see the script exists and has values though.