Will Icing Help?

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Ok so last night out of no where during one of the many times I woke up my wrist was hurting me really bad. I wasn't laying on it and didn't keep it in a weird position during the night so I don't know why it hurts. It like hurts when I move it around and even cracks sometimes. I've cracked my wrist a couple of times and it lessened the pain, but I don't know if it actually helps or makes it worse. Will icing it help? Or do I put heat on it? I've never had this last for so long.What do you think it could be if anything? Do you get wrist pains? What do you do to make it go away?