[Vocabulary] that is not much of a problem

[yi-ing]

I can still remember vividly that I was stung by a bee when I was about fourteen. For most people that is not much of a problem,although it hurts a lot.

Source: Cambridge IELTS Grammar

Why do the author use "much of a problem" instead of "much problem"? What is the difference between them?

 

[Rover_KE]

Why does the author use "much of a problem" instead of "much problem"? What is the difference between them?

' not much of a problem' means 'not a big problem'.

'... not much problem' is ungrammatical.