So, today was my first day in the gym since I injured my foot three months ago, and while I was warming up and checking technique on deadlifts at 135, on the first rep, about halfway up, I felt a really sharp pain in my lower left abdomen, by my intestines. I immediately put the bar down and sat down, and the pain subsided really quickly. My first thought was that it was a hernia, but the pain, though bad at first, went away really quickly. I didn't do any more heavy lifting after that for fear that it would happen again. Any ideas on what may have happened? It's the first time I've ever felt this.