Sheamus enters age 38 with what appears to be an arm injury.

"The Celtic Warrior" took to Twitter and shared a picture of his arm in a cast, which likely means he's the latest high-profile WWE Superstar to deal with an injury.

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John Cena (shoulder), Randy Orton (shoulder), Daniel Bryan (concussion), Seth Rollins (leg) and Nikki Bella (neck) are just some of the names sidelined right now. In his tweet, Sheamus joked that he celebrated his birthday too hard and was beset with an injury.

The specifics of how long he'll be sidelined aren't known at this time and the League of Nations member also didn't reveal how the injury occurred. His latest match was a tag bout on RAW where he teamed with Rusev to battle Roman Reigns and Dean Ambrose.

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When all else fails, Sheamus can always turn to Twitter for some comedic relief during his birthday. The WWE Superstar asked the fans what they think happened to his arm, and the Twitterverse didn't fail him, as it came up with some funny responses.

Here are the best ones, including a reference to WWE Hall of Famer "Cowboy" Bob Orton, who always wore a cast in the WWE, and the Clippers current situation after Blake Griffin broke his hand punching the assistant equipment manager.

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