What’s the difference between selective mutism and traumatic mutism?

"Is selective mutism caused by trauma/abuse?"

The short answer is not usually.

"Do I have selective mutism?"

I've been getting a lot of messages over the last few days with people asking me whether I think they have SM (yay for Awareness Month!). While I do want to try my best to help, answering the same question over and over again can get a bit much so if you are considering sending me a message like that, please read under the cut first.