Gum Bleeding

Hello, well my question is that my gums have been bleeding a lot for the past half-a-year. It used to be that they would bleed when I would brush my teeth but now they bleed whenever. Sometimes i will wake up and have dried blood on my teeth. They most frequently bleed in the top front teeth. I have yet to notice any bleeding on the bottom of my teeth but it seems the top front teeth seem to bleed all the time. The bleeding is coming from behind the teeth so i can't get a good look at whats going on. It has gotten me somewhat worried. Does anyone know what is happening or could be happening?
Thank you!