What is diastolic and what does it mean when the average readings lately have been around 83? previously it had been 78. btw what is the current blood pressure standard?

Can be normal: The diastolic number is the bottom number in a blood pressure reading, i.e. the "80" in a BP 120/80, which is the average normal blood pressure for an adult. However, BP varies by age, weight, medical conditions, and other factors. Generally, a diastolic number of 83 would be normal. For adults, above 90 is cause for possible concern. Please discuss your individual concern with your doctor.