My hips are popping like i was popping my fingers. why is this?

Internal vs external: Two broad types of hip snapping are more common. Internal snapping of the large psoas tendon that is juxtaposed to the anterior capsule can cause symptomatic internal deep snapping that is often audible to the patient and physician. External snapping hip is generally due to the iliotibial band snapping across the prominence of the femoral greater trochanteric bone. Examination confirms diagnosis.