It may be the start of something if you don't STOP and TAKE CARE of YOURSELF. It's sometimes one of the signs that you are entering, or are in, a time of stress. Stress often can trigger flares.
But if you stop and treat the stress, you can avoid the flare. Take a bubble bath, go to bed early, something.
Also, what meds are you taking? Some can increase the tendency toward stress, esp. prednisone. That doesn't mean you should stop taking it, but it does mean you have to be gentle with yourself.
You can't be acting like you are 20 years old, in perfect health, and out to conquer the world!
Lynnwood, Lupus & Sjogren's Moderator, Dx: 2002DIAGNOSING LUPUS & HW's LUPUS 101
"Life is far too important to be taken seriously." - Oscar Wilde