Hello, I'm Greg Jenna and good news, Your Dead to Me is back for a new series. Here we go. Yes, we'll explore Emperor Nero's notorious reign with Professor Marybeard and Patton Oswald. I would not want my daughter having the remote control, not alone an empire. We'll dissect the decadent life of Philippe Duke-Dor-Leon with Tom Allen. I've often tried to pretend I'm an aristocrat and being very quickly knocked down.

And there'll be so much more with comedians like Olga Koch, Mike Mosniak and Rihalina.

I'm excited.

You're dead to me.

The comedy podcast that takes history seriously.

Listen first on BBC Sounds.

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Welcome to the Inside Health podcast. I'm James Gallagher. Hello there.

Now, this week, we're getting to the bottom of a medical mystery. What is it that causes multiple sclerosis?

Then we're going to reflect on two years of the pandemic and whether we've just become numb to people dying from this virus.

But let's start with multiple sclerosis and its oh so elusive origins.

This is a disease that disrupts the flow of electrical messages in the brain and spinal cord,

and that has devastating consequences throughout our bodies.

Everything from vision to our ability to walk, bladder control,

thinking power can all be affected. But now scientists think they found the cause and with it

new ideas for how you can treat MS. And that's giving hope to people like Rachel Horn.

Rachel, welcome to Inside Health. Thank you. Can you just tell me, when did you

first suspect you might have multiple sclerosis? I was diagnosed with MS in 2009 when I was 43,

and for me, it came totally out of the blue. One week I was, you know, healthy and active,

and the next week, I started to have

a tingling in my hand, in my right hand. And then over a couple of days, the tingling sort of moved

up throughout my body. And then it got to a point where I actually couldn't walk. So at that point,

...