More FM host Sam Baxter shares story of two-year multiple sclerosis struggle

More FM host Sam Baxter says she's been fighting multiple sclerosis (MS).

The disease affects the central nervous system, causing problems with movement, sensation and body functions.

Baxter, 28, told listeners on Monday morning she had hidden the diagnosis - only her family and closest friends knew what she was going through.

"It's something I've been dealing with over the past two years, trying to get my head around it and what it means for me and my life."

She said receiving the news just over two years ago flipped her life upside-down.

"I remember when my neurologist phoned me and said, 'You have MS,' it felt like someone had kicked me in the guts."

The disease is more common in females, and normally detected when between the ages of 20 and 40.

The Multiple Sclerosis Society of NZ says there are only 4000 people in New Zealand with the disease, and its causes are unknown.

Baxter said she was inspired to share her story after seeing Selma Blair at the Oscars last week, after the actress recently spoke about her struggle with the disease.

"After watching Selma Blair at the Oscars and how she made me feel, I wanted to try and give that to someone else. Anyone who has MS or an autoimmune disease or chronic illness, you can do this."