Christina Applegate just opened up about some difficult news in her life.

Today, the 49-year-old actress revealed that she has multiple sclerosis. The film and TV star announced the news on Twitter, where she also shared how she's been doing since the diagnosis.

Christina Applegate reveals diagnosis of multiple sclerosis

"Hi friends," Applegate tweeted. "A few months ago I was diagnosed with MS. It's been a strange journey," she added.

"But I have been so supported by people that I know who also have this condition. It's been a tough road. But as we all know, the road keeps going. Unless some asshole blocks it."

The actress followed up her initial announcement with another tweet, which reads: "As one of my friends that has MS said 'we wake up and take the indicated action'. And that's what I do. So now I ask for privacy. As I go through this thing. Thank you xo."

According to the Mayo Clinic, multiple sclerosis is "considered an autoimmune disease in which the body's immune system attacks its own tissues," and it is a "potentially disabling disease."

We send our best to Christina as she faces MS and comes to terms with her diagnosis. She's also a survivor of breast cancer, having beaten the disease in 2008.

Applegate, 49, has been starring on Netflix's Dead to Me since 2019, after memorable film and TV projects like Anchorman, Bad Moms, Jesse, and her breakout role as "Kelly Bundy" on Married... with Children in the '90s.