Your period may show up every month and annoy you with the cramps, bloating, and fatigue that come along with it, but it deserves a little respect. Your monthly flow can actually provide a lot of insight into your overall health. For instance, if you’re struggling with irregular periods, that’s a sign you may be dealing with a thyroid problem, polycystic ovary syndrome, or a hormone imbalance, or that you’re underweight. And if it doesn’t show up at all, well, you might want to try a pregnancy test.