To answer your question you need to provide some clinical data like: how old are you, do you suffer from any severe diseases, do you take any drugs, do you drink an alcohol and how often, in which part of abdomen is this pain located (is it on your right or left lower abdominal area?). Do you suffer from nausea
, is there any blood or mucous in your stool, do you have diarrhea
problem have you had any abdominal operations, does it appears after a meal, do you take any drugs that relieves your pain, do you have a fever
, since when do you suffer from this pain, have your weight has changed since last time, do you have any pain or burning during urination?
Without this answer it is very hard to tell what causes your pain. It is advisable for you to have at least performed abdominal USG, some blood and urine tests.