###Human: I am getting shooting abdominal pain during and in between periods. Why? ###Assistant: Hi. This is called primary dysmenorrhea. It can start anytime within five years of the beginning of periods in girls. Do not worry. It is a benign condition but definitely painful. I would advice start taking tablet Naproxen 250 mg twice daily with meal two days before your expected periods and take 500 mg twice daily on the day of the start of the cycle. You can continue for 2 to 3 days even after starting cycles if needed. This will help in preventing pain. When you grow up, mostly it will go away.