The former Happy Days star shared the sad news with fans on on Tuesday (16Jun15), revealing doctors are treating the condition.

Baio, who shares a seven-year-old daughter, Bailey, with Renee, wrote, "Just a few days ago we learned my wife, Renee, has a meningioma brain tumor. Although 90% of these type of tumors are benign they can cause serious problems depending on the size of the tumor and the location. We are waiting to learn the exact location to see if its (sic) operable.

"Renee has been down some rough roads in her life, yet each time with her strong faith in God, she comes through a better and stronger person. During this time we ask for your prayers and support."

Baio adds, "My wife is my rock. She refuses to even shed one tear, nor will she question God's will. Renee, Bailey and I will get through this and along the way maybe help educate others to get checked out (MRI with contrast) as 6500 people each year, mostly women, get these tumors."

He later took to to thank fans for their support, tweeting, "Thank you for the prayers & support for my wife. Sometimes God throws you a curve ball."

The Baios previously underwent a health drama in 2008, after medics told them their daughter had been diagnosed with a rare metabolic disorder. She was given the all-clear weeks later.