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What causes low blood pressure (diastolic)? When is low or high diastolic pressure dangerous?
The question of what causes low blood pressure (diastolic) is one of the first things many individuals wonder about when they notice changes in their blood pressure values. Many factors, from daily lifestyle habits to stress levels, from diet to overall health status, can affect diastolic pressure. Therefore, it is important not only to know whether the value is high or low, but also to understand why it occurs.
In this article, we discuss step by step what diastolic pressure is, what its normal values should be, why it increases or decreases, and what can be done in these situations.
What is diastolic pressure?
Diastolic pressure is the lower of the two values obtained when measuring blood pressure and is medically referred to as diastolic blood pressure. Our heart pumps blood into the vessels and then rests briefly. The pressure in the vessels during this resting phase is called diastolic pressure. In other words, it reflects the pressure that the vessels are exposed to when the heart is at rest.
To elaborate further, in daily life, blood pressure is often expressed as something like “120 over 80.” The value 80 here represents diastolic pressure. This value provides important clues about vascular health and the circulatory system. Because not only systolic pressure but also diastolic pressure needs to be balanced. When both are evaluated together, a clearer picture of the body’s blood circulation emerges. To better understand diastolic pressure values, we will also address questions such as “What should diastolic pressure be?” and “At what level is diastolic pressure dangerous?” in the rest of this article.
What should the diastolic pressure be? When is it dangerous?
It is very important for vascular health that diastolic pressure remains within the normal range. Medically accepted normal values are between 60–80 mmHg. To interpret the values more clearly, we can classify them as follows:
- Below 60 mmHg: Low blood pressure
- 60–80 mmHg: Normal range
- 80–90 mmHg: Borderline
- 90 mmHg and above: High diastolic pressure
Especially if diastolic pressure is consistently above 90 mmHg, it may pose a risk for hypertension. However, a single measurement is not sufficient for an accurate evaluation. Diastolic pressure should always be assessed together with systolic pressure to draw reliable conclusions.
What causes low blood pressure to increase?
An increase in diastolic pressure usually indicates that the pressure inside the vessels has risen. This condition often occurs due to the combined effect of multiple factors. The main factors include:
- Excessive salt consumption
- Stress and anxiety
- Sedentary lifestyle
- Excess weight
- Smoking and alcohol use
- Kidney diseases
- Hormonal imbalances
The most critical aspect of high diastolic pressure is that it often progresses without noticeable symptoms. Therefore, especially if you have a family history of blood pressure problems or are in a risk group, it is important to make regular blood pressure monitoring a habit.
What are the symptoms of high diastolic pressure?
Symptoms of high diastolic pressure may vary from person to person. Although high values may not always cause symptoms, some individuals may experience:
- Headache (especially in the back of the head)
- Dizziness
- Ringing in the ears
- Blurred vision
- Palpitations
- Fatigue
- Rarely, nosebleeds
However, it should be emphasized again that the absence of symptoms does not mean blood pressure is normal. Therefore, if diastolic pressure is above normal values, it is important to consult a specialist.
How to lower high diastolic pressure?
To lower elevated diastolic pressure, we first need to determine whether this is a temporary condition or a persistent problem. Factors such as stress, excessive salt intake, or lack of sleep during the day may temporarily raise diastolic pressure. In such cases, simple measures may help restore balance.
In some cases, long-term lifestyle changes are the answer to how to lower diastolic pressure. Factors that may help reduce diastolic pressure include:
- Increasing daily water intake
- Reducing caffeine consumption
- Eating a healthy diet
- Controlling salt intake
- Exercising regularly
- Practicing breathing exercises
- Managing stress
If diastolic pressure remains consistently high, this is no longer a temporary issue but one that requires medical follow-up. A healthcare professional should be consulted for evaluation in terms of hypertension risk.
What causes diastolic pressure to decrease?
A decrease in diastolic pressure, meaning it falls below normal values, usually indicates a change in the body’s circulatory balance. While this may sometimes be temporary and harmless, in some cases it may signal an underlying health problem.
To better understand the causes, let’s look at the most common reasons:
- Dehydration
- Prolonged fasting
- Sudden standing up
- Anemia
- Fatigue and lack of sleep
- Use of certain medications
- Heart or hormonal problems
Low diastolic pressure often manifests with symptoms such as dizziness, weakness, and darkening of vision. If these complaints persist, the situation should be taken seriously.
Is low diastolic pressure dangerous? How can it be increased?
Low diastolic pressure usually does not cause a serious problem on its own. Especially, occasional drops that do not affect daily life are considered harmless. However, if it causes symptoms or occurs frequently, it should be taken into consideration. Because insufficient blood flow to the body may increase the risk of dizziness, fainting, and falls in some cases.
Therefore, when evaluating low diastolic pressure, it is important to consider not only the number but also accompanying symptoms and how often it occurs.
Some ways to increase diastolic pressure include:
- Drinking plenty of water
- Eating regularly
- Increasing salt intake under medical supervision
- Avoiding sudden movements
- Doing light exercise
Frequently Asked Questions
What should be done if the diastolic pressure is low during pregnancy?
Low diastolic pressure during pregnancy is a common condition. The main reason is that hormones released during pregnancy relax the blood vessels and lower blood pressure. This is especially more noticeable in the first trimester.
Although it is usually temporary and considered normal, caution is needed if symptoms are severe. In such cases, the following measures can be taken:
- Drinking plenty of water
- Eating small and frequent meals
- Avoiding sudden movements
- Lying on the left side
Although low diastolic pressure during pregnancy is often a natural process, a doctor should be consulted if there is severe dizziness or fainting.
What should be done if the diastolic pressure is 100?
A diastolic pressure of 100 is considered above the normal range and is classified as high diastolic pressure. Seeing this value in a single measurement does not always indicate a serious problem, but if it occurs frequently, it should be taken into account.
Instead of panicking, it is important to manage the situation properly. You should rest and measure again. On the other hand, if it persists, consulting a specialist is the right approach.
What should be done if systolic pressure is high and diastolic pressure is low?
When systolic pressure is high and diastolic pressure is low, it indicates a widened gap between the two values. This does not always mean a disease on its own, but it is a condition that should be monitored carefully.
Such cases may indicate arterial stiffness or cardiovascular problems. The following steps can be taken:
- Repeat the measurement and monitor it throughout the day
- Review lifestyle and dietary habits
- Pay attention to sudden symptoms such as dizziness, palpitations, or chest pain
If systolic pressure continues to remain high and the gap increases, a healthcare professional should be consulted.
At what level does low diastolic pressure cause dizziness?
Diastolic pressure usually causes symptoms such as dizziness, lightheadedness, and darkening of vision when it falls below 60 mmHg. However, this may vary from person to person. Some individuals may experience symptoms even with mild drops, while others may not feel any symptoms despite low values. If dizziness occurs frequently or is accompanied by a feeling of fainting, diastolic pressure should be monitored, and a specialist should be consulted.
How should diastolic pressure be measured correctly?
Proper measurement is essential for accurate evaluation of diastolic pressure. Incorrect measurements may lead to misleading values and incorrect conclusions. To measure blood pressure correctly, the following should be considered:
- Rest for at least 5 minutes before measurement
- Sit in a supported position during measurement
- Keep the arm at heart level
- Avoid caffeine and smoking before measurement
- Take several measurements at different times during the day
Evaluating blood pressure based on multiple measurements over several days rather than a single reading provides more reliable results.