1998 Honda Accord Thank You First Bought Car Noticed Every Time Drove Through

THANK YOU! When I first bought my car i noticed every time I drove through a small bump something in the back seemed to make a noise. As if something was lose and was dropped back in place everytime i past through a bump. I checked the trunk, figured it was the spare tire making noise, it wasn't. I have no clue what it is, maybe the springs on the back are loose? Help? thanks