I woke up, one morning, after a very stressful event and my face was numb. I just thought it was caused by the stress and never told anyone. I was 24. It came to pass that, that was my first MS symptom that I can remember.
That went away in short time and then nothing until my 28th Birthday party. I was imbibing, of course and when I was dancing the Jitterbug, my left arm and hand went numb. I blamed it on the alcohol and again, blew it off.
It seems like my numbnesses did not build, but came on, rather suddenly, without warning.

When I was finally DX at 34 or 35, I had numbness in my legs, especially my thighs. That lasted for a couple of months and then I went into remission until the numbness hit me again when I was 51.
The numbness since then has been pretty constant. Sometimes bad and sometimes not so bad, but never really went away, after that. I now have some constant numbness, mostly on my left side. I am SPMS.