"It’s been a strange journey," the Emmy Award-winning actress tweeted Tuesday. "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 (expletive) blocks it."
"As one of my friends that has MS said ' we wake up and take the indicated action'. And that’s what I do," Applegate, continued, asking for privacy "as I go through this thing."
More from USA Today:
The National Multiple Sclerosis Society website describes MS as "an unpredictable, often disabling disease of the central nervous system that disrupts the flow of information within the brain, and between the brain and body."
Other celebrities living with MS include Selma Blair, Joan Didion, Montel Williams, Clay Walker, Jack Osbourne, Jamie-Lynn Sigler, and Teri Garr.
The actress previously spoke out about health struggles in 2008, when she was diagnosed with breast cancer and underwent a double mastectomy. In 2017, Applegate revealed she had also removed her ovaries and fallopian tubes to prevent further cancer diagnoses.