L5-S1 disc protrusion

MRI done 4-6-05 findings- (1) Mild degenerative disc disease at L1-L2 (2) L3-L4 and L4-L5 minor anular bulge and disc dexiccation. (3) L5-S1 disc desiccation. Posterior central disc protrusion. This abuts the midial margin of the right S1 nervve root, without displacement. What does all of this mean. I know it means my back hurts, but can you explain findings- Thank you, Sharon