The mnemonic is "APPENDICITIS" itself for the differential diagnosis of Right lower quadrant pain.
P: Pelvic Inflammatory Disease, Period (Menstrual)
E: Endometriosis, Ectopic pregnancy
C: Cyst (ovarian)
I: Inflammatory bowel disease (Crohn’s)
T: Torsion (ovary)
I: Irritable bowel syndrome