It sounds like the appendix. It can be acute or start out with slight pain and get worse. I would see a doctor.
you don't disclose much info. There are many many reasons to explain a lower right abdominal pain:
appendicitis?
ovulation?
abdominal cyst?
ibs?
cron's disease?
pelvic inflammatory disease?
period pains?
a gas build-up?
if it was sever pain let some body hold your right arm for 5 mins if the pain is gone it ia appendcitis if it has nothing to do with it you got 2 other propabilties could be liver or the ascending colon one viceralgine tablet as anti spasmodic could make u o.k