FOX News’ Janice Dean has opened up about her decades-long, invisible battle with multiple sclerosis.

Dean, who was diagnosed with multiple sclerosis (MS) in 2005, shared a heart-filled message to her fellow warriors on World MS Day.

“I call it the invisible illness, the ‘My, you look so well’ disease because we can be looking fine, I got my hair and makeup done, but inside our body is attacking its central nervous system, the brain, and the spine,” Dean shared.

“There’s a communication breakdown between the messages our brain sends to the rest of our body.”

The Fox News Channel weather anchor then says that on World MS Day, she is feeling the effects of her illness.

“On this World MS Day, I am actually feeling symptoms of my multiple sclerosis,” Dean said.

The Fox & Friends anchor shared how she’s been dealing with a sunburn sensation on the back of her neck.

“Even though we look okay on the surface – I got my hair and makeup done, I’m smiling on Fox & Friends – inside can be quite a challenge and what it feels like,” Deans says as she lets off a big sigh.

“So it’s sometimes tough to put on that smiling face, but we have to do it, and I wanted to, on this World MS Day, thank you to all my fellow MS warriors who continue to move despite the challenges every day.”

Multiple sclerosis is a potentially disabling disease of the central nervous system.

The illness causes the immune system to attack the protective sheath that covers nerve fibers and causes communication problems between the brain and the rest of the body, according to the Mayo Clinic.

There’s no cure for multiple sclerosis.

More than 2.8million people have an MS diagnosis worldwide, according to the National MS Society.