Sudden onset of certain types of illness can do it, I suppose. Or am acutely life-threatening situation, perhaps? I don't know, I guess all that depends on what you mean by emotional numbness.
And if you are asking what is happening in the body to produce such numbness, I have no clue, though there are a lot of hypotheses out there.
And if you are asking what is happening in the body to produce such numbness, I have no clue, though there are a lot of hypotheses out there.