The "Who am I" singer posted the sobering announcement via a Facebook message on Thursday afternoon:

"Hey Casting Crowns Family, I would appreciate your prayers.

"Doctors found a solid mass in my right kidney about a week ago. They are 90% sure it's cancer and they are going to remove the entire kidney next Wednesday, March 11th. They believe the cancer is contained in the kidney, which is also a great hope. They will know more once it is out and Pathology can see it.

"I'll be in recovery for a month or a little longer because of the surgery. Please pray for healing and for God's peace for my family." (Photo via christianrbands.blogspot.com)

Hall signed the note with his name along with the words "Praising Him in This Storm," a reference to one of Casting Crowns' songs, "Praise You in This Storm," which includes the lyrics, "Every tear I've cried/ You hold in your hands/ You never left my side/ And though my heart is torn/ I will praise You in this storm."

Instantly, thousands of well-wishers, including popular Christian artists Kutless and Michael W. Smith, responded to Hall's request for prayers, "liking" his post and sharing it on Twitter and Facebook using the hashtag #PrayingforMark.

"Join me in praying for my friend, @markhallCC in a battle with cancer. Praying w/ faith for healing! #PrayingforMark," Smith Tweeted.

"Please join us in #PrayingforMark from @castingcrowns! Praying for the Lord to heal him!" added Christian rock group Kutless.

Popular Christian bookstore LifeWay also expressed their support, writing "Join us in #PrayingforMark Hall of @castingcrowns as he faces a potential battle with cancer."

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