Today in math I got a sharp pain along the side of my stomach or side, It was like that from my 2nd class to my 3rd (I have lunch then) When I ate it was fine it does this every time i skip breakfast but i had breakfast already today and it still hurt, any ideas why? and NO I do NOT have an eating disorder (I know some will say this) It been like that since grade 7 (10 now) I'm the normal weight of my age, and I eat when i'm suppose to. But i just wanna know what this could be.

Thanks in advance =D