# Diastolic blood pressure The pressure in your arteries when your heart rests between beats.[^1] This is the second number when you would say “120 over 80” or write “120/80 mmHg” for a [[Blood pressure]] reading of 120 [[Blood pressure, systolic|systolic]] and 80 diastolic. --- # #### General References - [CDC: High blood pressure symptoms and causes](https://www.cdc.gov/bloodpressure/about.htm)