Unexplainable pain

So for the past year or so a few days or a day before my period starts i begin experiencing extreme pain in my left hip almost feels like it's the hip bone? and i've seen a chiropractor because it felt like the bone and i received the explanation of "You are probably about to start your period" which is fine but i want to understand why it hurts so bad because it's not every single month. and it just is a random sharp consistent pain in my hip. always my left and always for about an hour before there is any break between the pains. I've accepted that it is probably from period pain but why? Why does it do that? I'd love anyone to share their stories or explanations that may have?👍🏻