As a kid, Ben struggled sometimes with speech and due to neglect it largely went unnoticed how non-verbal he was.

Now, as an adult, after the events of TFA, it comes back and he's very scared of how it might affect his status and offend others in the First Order.

+1 if he also struggles with understanding speech when he gets unwell
++1 if he even has trouble reading or writing in these times and he feels like he's making it up, I don't know if it's called selective mutism still or something else but this please, thank you