Pain in the feet can be due to Peripheral Neuropathy starting up.

You can have other things wrong when you have MS.

The most common causes of PN is impaired glucose utilization (which begins before diabetes type II) or low B12.

My PN started in my feet, when I was around 30 (before my son was born) and was due to hypothyroidism. It also was in my hands and I recall the first signs was having my hands go numb while driving. My job was 100% standing, and we rarely even got a lunch break, so years of 13 hr days, and long weeks, were tough, and I thought that was the cause back then. I've learned alot since then!

There are over 100 causes of PN... it is sneaky and difficult to understand.