Causes of pain in the right lower quadrant can be:
Mesenteric adenitis
Appendicitis
Abdominal abscess
Abscess of right psoas muscle
Right kidney stones
Calculus of the right ureter
Testicular cancer retained
Right colon cancer
Right ovarian cyst
Cystitis
Cholecystitis
Ulcerative colitis
Caecal diverticulitis
Right colon diverticulitis
Meckel’s diverticulum
Ovulatory pain (Mittelschmerz)
Abdominal wall hematoma
Endometriosis
Epididymo-orchitis
Incarcerated or bullshit inguinal hernia
Ileitis
Crohn’s disease
Inflammatory bowel disease
Pelvic inflammatory disease
Intestinal obstruction
Right hip pathology
Right pyelonephritis
Ruptured ectopic pregnancy
Ruptured aortic aneurysm
Salpingitis
Irritable bowel syndrome
Constipation
Right testicular torsion
Right ovarian cyst torsion
Right ovarian torsion
Perforated ulcer
Seminal vesiculitis