How To Treat Pain In Lower Abdomen Observed After Lifting Weights?

I have a pain in my lower abdomen after lifting weights on Monday. I did not really notice it until a few hours after working out. The pain is particularly sharp when I am bending over and shifting from sitting to standing. There is no bump or protrusion characteristic of a typical inguinal hernia. Any help you can offer?I am a 30 year old active male.