My apologies for the delay in getting back to you. I was not receiving notifications that anyone had posted to the board.
You ask a good question.
There are two reasons that a tongue can be pale: Cold OR Blood Deficiency. That’s the tricky thing about a pale tongue, as we often need more information such as the coating and other signs and symptoms.
In this case, there is no other mention of Blood, plus the coating is moist. We have to think, “Why is the coating moist?” Well, it’s likely due to all the Cold, and the body isn’t able to warm/transform fluids very well anymore.
I hope this helps. Just remember: pale tongue = two options. It’s up to you to look for other signs in the case study to determine which one makes more sense.