I'm wondering if a blood pressure reading of 113 over 81 is considered normal. My diastolic seems to fluctuate between 81 and 90 and I'm noticing that my systolic always tends to stay on the lower side. Could you give me some insight into whether this is something I should be concerned about or if it's within a normal range?

Blood pressure of 11381 is considered normal. Diastolic blood pressure fluctuating between 81-90 is still within normal range. It is common for diastolic blood pressure to fluctuate slightly. As long as your systolic blood pressure remains on the lower side and within normal range, there is usually no cause for concern.