MANILA - Sebastian "Basti" Artadi of Wolfgang, a popular Filipino hard rock band born during the 1990s, has been diagnosed with a "tumor in [his] head," the singer revealed on his personal Facebook page.

Aratadi, in his post Tuesday, said he has been battling the disease since 2009 but has decided to keep the news from his fans because he "didn't want it to be a distraction from the music."

"Shit happens," Artadi admitted, adding that doctors have told him that his medical condition could lead to him being unable to talk, let alone continue his singing career.

"In 2009, I was diagnosed with a tumor in my head. This tumor is on the nerves that control the right side of my face which is what is causing the paralysis," he wrote. "As a result I had to relearn to sing with a paralyzed mouth and the fatigue that comes with it."

According to Artadi, his tumor has since worsened and is raising funds by selling shirts online for a procedure that could "temporarily" help his situation called "facial sling."

Referring to the design of the shirt, he said: "It is just a picture of my face which I thought would be a good symbol for me getting back the lost symmetry. So no, it is not because I'm full of myself.

"I thank God everyday because I'm lucky that this thing still left me with the ability to sing. What would have really sucked is if it took 100 percent of motion from the get go.

"So we move on and we do the best we can with what we have. Thanks and I'll see you around town!" Artadi, who did not reveal the exact cost for the procedure, concluded.

Artadi is one of the four members of Wolfgang alongside Mon Legaspi (bass), Wolf Gemora (drums) and Manuel Legarda (lead guitar). He left the country after the band broke up in 2002 to raise a family in the US.

The band reunited in 2008 and released their seventh studio album, "Villains." Last month, Wolfgang, with Artadi, was seen performing one of the singles off the album for an online YouTube channel (video above).

In addition to being the lead vocalist of Wolfgang, Artadi is also part of the cast of theater company 9 Works Theatrical's local adaptation of Green Day's rock opera, "American Idiot," which opens on Friday.