Carnie Wilson revealed on her Twitter last week that she is suffering from a nerve disorder commonly known as Bell's Palsy.

Wilson-Phillips singer Carnie Wilson explained to her fans via Twitter that she has Bell's Palsy, a nerve disorder that causes paralysis in one side of her face. She says the disorder is affecting her left side.

"Just wanted you all 2 know that I have Bell's Palsy on [left] side of face right now. Scary, unfortunate, but it goes away. A challenge! Love u," her tweet last week read.

She also mentioned later that she has been successfully treating the disorder with acupuncture.

Bell's Palsy is a type of facial paralysis that is generally temporary and results from facial nerve dysfunction. It should not be confused with the type of paralysis that results from a stroke.

Carnie Wilson has struggled with her weight for many years and has always been very open with fans about it. So it is no surprise that she is equally honest about her latest medical ailment.

When her second weight loss surgery appeared on the reality show Wilson-Phillips: Still Holding On, she was candid about the experience. "This is what's happening in my life, and I'm not going to hide anything," the 44-year-old singer commented to TV Guide. "It's what I'm going through. It's what a lot of people need to see because they've trusted me to be open with them. It's like a responsibility for me."

It seems like she is following up with that idea by letting everyone know about her current disorder as well.

So what is Bell's Palsy exactly?

It is a temporary facial paralysis that results from damage or trauma to the facial nerves. Messages sent from the brain to the facial muscles are interrupted, which leads to facial weakness or paralysis.

Bell's palsy affects roughly 40,000 Americans each year. It is equally common in men and women and can occur at any age, but it is more common between the ages of 15 and 60.