Thank you for the query.
It would be much easier if you could mention what tests have you had performed, otherwise, it will be very hard to help from here.
Such lower right pain can be caused several diseases including urinary tract infection
, urinary tract stones (frequent urinating, burning while urinating should be present), ovarian cyst
(if you are female), large intestine inflammation (Crohns disease
, especially if you are about 20-30 years old, have had diarrheas, blood in stool
, weight lost), colon cancer
(especially if you are 50 or older, have had constipations, blood in stool), inguinal hernia (the pain aggravates while coughing).
Hope this will help.