Arians said that Palmer was excused from practice Wednesday so that he can go see another specialist regarding a nerve issue in his shoulder.
"He threw a bunch last Thursday and Friday and then regressed," Arians said Wednesday, via NFL Media's Alex Flanagan.
This isn't a simple injury that a player can rehabilitate to make better. Nerve issues are unpredictable and often threaten a player's livelihood. Seeing another specialist after suffering a setback makes us wonder when, and if, Palmer will get back on the field this season.