Katie Mattin shares the symptoms that led to her multiple sclerosis diagnosis.

Katie Mattin was 25 years old and had recently given birth to twins when she noticed some unusual symptoms.

As The Brisbane radio host recalls, one of her toes became numb while she was breastfeeding her daughters Holly and Amelia — but because it was a cold night, she didn’t think much of it.

“The next morning it wasn’t any better and over about a week it gradually got worse and moved up one leg,” Mattin tells QLD newspaper The Courier Mail.

Mattin didn’t seek medical attention until she lost feeling in her other leg while crossing the road one day.

“I remember feeling really scared because I just thought ‘Oh my God, if a car came around the corner fast right now I literally wouldn’t be able to run away’,” the Nova 106.9 presenter says.

An MRI and a lumbar puncture revealed Mattin had Multiple Sclerosis — an incurable disease of the central nervous system that affects nerve pulses in the brain, optic nerves and spinal cord. In Australia, there are currently more than 23,000 people living with MS.

Over the past seven years, the only people who knew about Mattin's diagnosis were her family, husband and close friends. She admits it was an emotionally challenging time and has since conducted her own research into MS symptoms.

"With MS, no two people's experiences are the same, so it's a lot of 'what if this happens?'. I remember my husband saying to me 'hang on a second, what if it doesn't?"

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Now, Mattin is providing that visibility and awareness for others. She's signed on as an ambassador for the upcoming BMS Brissie to the Bay bike ride, an annual fundraising event organised by MS Queensland.

Mattin is the second high-profile woman to speak publicly about her experience with MS this year. Last month, American actress Jamie-Lynn Sigler revealed she had been living with the degenerative disease for 15 years.

The Sopranos star — who was 20 years old when she was diagnosed — admitted that while it's manageable now, dealing with her condition has required a "fighting attitude".

"I can't walk for a long period of time without resting. I cannot run. No superhero roles for me. Stairs? I can do them but they're not the easiest. When I walk, I have to think about every single step, which is annoying and frustrating," the 42-year-old explained in an interview with People magazine.

The precise cause of MS is not currently known, however it's believed a combination of genetic and environmental factors play a role. Every person experiences the illness differently, depending on what part of their central nervous system is affected and how seriously.

According to MS Australia, the symptoms of the disease vary and can be unpredictable. However, some of the most common signs include fatigue, pain, bladder and bowel issues, cognitive fog, vision problems, numbness and fatigue.

You can find more information about MS here.