What does a lower diastolic pressure means?

Stiff arteries: A normal or high systolic pressure with a low diastolic pressure suggests stiff arteries. If you think of pumping blood into a solid pipe, the pressure would fall to zero between pumping. The arteries usually expand during systole, but if they cannot, the swings in pressure will be greater than normal.

How low?: If you do not have any symptoms and is it is between to 60 mmhg, it is probably normal for you. It is hard to diagnose someone just based on a number, may things can cause a drop in the diastolic bp, infections, dehydration, hormonal problems, heart problems, pregnancy, blood loss, lack of nutrient among many others.