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Austin Mahone’s mystery illness has been revealed.

A rep for the singer tells Gossip Cop he was “admitted to the hospital with 104 temperature and is being treated for a blood clot and extreme inflammation in his throat, as well as severe dehydration.”

On Thursday, Mahone posted an Instagram picture of himself hooked up to an IV drip (see right), along with the caption, “I’ve never felt so bad.”

Later that day, the pop star was forced to postpone his “MTV Artist to Watch Tour.”