Stiffness in MS is also called "spasticity".

I get that in my feet and legs. In my feet it makes my toes hurt and feel stiff. In my legs, it basically causes muscle spasms that give me Charley Horses From Hell while I'm sleeping. My feet feel like they're trying to kick me in the butt with my heels.

I also get the spasticity in my ribs. The ever infamous MS "Hug". It's a horrible symptom. It really caused me a lot of pain earlier this summer. Hated it! Literally felt like I had a giant python wrapped around my ribcage trying to squeeze me to death. Hurt like heck!