Hi.. I am a 20 year old business woman.. I just notice that whenever I go to the gym, when running on the thread mill my lower left abdomen hurts, specially when I drink water. Also when having contact with my partner, It wouldn't hurt while doing it.. But after I can feel that it slightly hurts.. I'm so worried about this.. can you help me... I would want opinions here and references too before I consult a doctor for better understanding.

Thank You!