It's hard to say. There's so many things it could be. It could be you have low blood sugar, or you're dehydrated, or you could have overextended your muscles, or it could be anxiety. If it continues, then you might want to get it checked out.
I HAVE HAD THE SAME PROBLEM SINCE I HAD THE HIGHEST FEVER OF MY LIFE 104.7 DEGREES F. WHICH HAPPENED 2 YRS AGO. I HAVE NEVER BEEN ABLE TO FIGURE OUT WHAT IT WAS. I'M THINKING I SHOULD GET IT CHECKED OUT. SORRY I COULDN'T BE OF ANY HELP.