(Learner-here) Lists + Functions = headache

[Bradley Wright]

Hey guys and gals doing this tutorial(codecademy) and needed a bit help from the experienced.

I'm writing a function that takes a list(one they supply during runtime)
here's what my function is supposed to do

1. for each instance of the string "fizz" make a count
2. Finally return that count

here's my code:

def fizz_cout(x):
    count = 0
    for item in x:
        while item == "fizz":
            count += 1
            return count

Please remember that i am a eager beginner, where am i going wrong?