Visceral
Abdominal hernia
Adhesion
Appendicitis
Diverticulosis
Inguinal or femoral hernia
Testicular torsion
Varicocele
Associated with the hip
Acetabular labral tear and femoroacetabular impingement
Avascular necrosis
Iliotibial band syndrome
Osteoarthritis
Snapping hip syndrome and iliopsoas tendinitis
Infectious
Abscess
Diverticulitis
Herpes infection
Osteomyelitis
Septic arthritis
Urinary tract infection
Inflammatory
Endometriosis
Epididymitis and orchitis
Inflammatory bowel disease
Pelvic inflammatory disease
Prostatitis
Synovitis
Traumatic
Muscle contusion
Stress fracture
Tendon avulsion
Neurologic
Nerve compression syndrome
Referred pain (sacroiliitis, hamstring pain, knee pain)