Mostly interchangeable, here are some notes: A: "Your problem is the same as everyone else's" B: "I disagree. My problem is of great importance" Notes: When speaking to an official or someone in a formal setting, this is probably the version you would use if you want to be taken seriously. A: "You're making this a big deal. What's your problem?" B: "This is an important issue, that's why I have a problem. " Note: "The problem is very important", I don't know if I would ever use these words even though it makes sense, and I would opt for this instead: "This is an important issue". Would be used in less formal settings.

The same