So just a few minutes ago, I felt this spasm, this single spasm in my upper abdominal area, it only lasted a second, it felt like I was being punched, but it didn't hurt. This isn't the first time I've felt this, back in high school, I would feel this spasms, it would last a second and nothing else happened, however, I would manage to lose some weight, the most recent one other then what I felt just a few minutes ago was about two months ago where, despite not being very painful, it was the most intense spasm I've felt thus far, like a huge punch in the stomach. I'm guessing this happens every time I make a change in my diet or exercise habits, I just recently started exercising again. Should I be concerned about this?