William Shatner is doing it.

Hugh Jackman (far left) is doing it.

Are you doing it?

It's time to grab your stuff, boys, and feel around for lumps that don't belong there (note: those two big lumps are your testicles).

Feeling Nuts Challenge for men goes viral

By Sara Cheshire, Special to CNN
Fri October 3, 2014

Men, are you #feelingnuts?

STORY HIGHLIGHTS

• #feelingnuts is raising awareness online of testicular cancer
• Celebrities Hugh Jackman and William Shatner have joined in
• Testicular cancer typically affects young men
• Experts estimate 8,820 cases of testicular cancer will be diagnosed this year in the U.S.

(CNN) -- Now that the Ice Bucket Challenge has made the rounds, a new trend is on the rise: crotch grabbing -- for testicular cancer.

Stars such as Hugh Jackman and William Shatner have already participated in the Feeling Nuts Challenge, which you can follow online with the hashtag #feelingnuts.

Why testicular cancer awareness? Unlike some other cancers, testicular cancer typically affects young men, with an average age of diagnosis 33, according to American Cancer Society. The organization estimates that 8,820 new cases of testicular cancer will be diagnosed this year in the United States.

Fortunately, it is highly treatable if discovered early.

Men who have cryptorchidism, or an undescended testicle, are more at risk, along with those with a family history of the cancer. White males have the highest risk, followed by Latino, Asian-American and black men, according to the ACS.

So if you're joining the Feeling Nuts Challenge, feel for lumps and follow up with a doctor if anything seems amiss.