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Low Blood Pressure Symptoms | Hypotension Explained

Low blood pressure (hypotension) causes symptoms like dizziness, fatigue, and fainting. Learn which signs to watch for and when to seek medical advice.

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Things worth knowing about "Low blood pressure symptoms"

Low blood pressure (hypotension) causes symptoms like dizziness, fatigue, and fainting. Learn which signs to watch for and when to seek medical advice.

What is low blood pressure?

Low blood pressure, medically known as hypotension, is generally defined as a systolic blood pressure (the upper value) below 90 mmHg, although many experts use 100 mmHg in women and 110 mmHg in men as the threshold for clinical relevance. Low blood pressure is common, especially in young, slender women, and is often harmless. However, in more severe cases it can significantly affect quality of life.

Symptoms of low blood pressure

Symptoms occur because the brain and other organs do not receive enough blood and oxygen. The most common symptoms include:

Dizziness, especially when standing up quickly (orthostatic hypotension)
Fatigue and general weakness
Blurred or darkening vision
Headaches, particularly in the morning
Difficulty concentrating and mental fogginess
Rapid heartbeat or palpitations
Fainting (syncope) in severe cases
Cold hands and feet due to poor circulation
Pale skin
Nausea and loss of appetite

Causes of low blood pressure

Low blood pressure can have various underlying causes:

Primary (idiopathic) hypotension

This form occurs without any identifiable underlying disease. It is often constitutional, meaning it is related to a person's natural physical makeup, and commonly affects young, slender women.

Secondary hypotension

Here, a specific medical condition or trigger is responsible, such as:

Heart conditions (e.g., heart failure, arrhythmias)
Dehydration or fluid loss
Hormonal disorders (e.g., adrenal insufficiency, hypothyroidism)
Medications (e.g., antihypertensives, diuretics, antidepressants)
Blood loss or severe infections
Pregnancy

Orthostatic hypotension

This specific form occurs when blood pressure drops rapidly upon standing from a sitting or lying position. It is more common in older adults and significantly increases the risk of falls and dizziness.

Diagnosis

Diagnosis is made through repeated blood pressure measurements at rest and while standing. Additional diagnostic steps may include:

24-hour ambulatory blood pressure monitoring
Blood tests (e.g., thyroid function, complete blood count, electrolytes)
ECG to assess heart function
Schellong test (blood pressure measured lying down and then standing)

Treatment and tips for low blood pressure

For mild hypotension without an underlying condition, simple lifestyle measures are often sufficient:

Stay hydrated: Drinking at least 2 liters of fluid per day helps stabilize blood pressure.
Salt intake: A slightly higher salt intake can be beneficial, unless contraindicated.
Rise slowly: Avoid sudden changes in position to reduce dizziness.
Compression stockings: Help improve venous return, especially in orthostatic hypotension.
Regular physical activity: Exercise strengthens the cardiovascular system.
Contrast showers: Alternating warm and cold water stimulates circulation.
Caffeinated drinks (e.g., coffee, tea) may provide short-term relief.

When hypotension is caused by an underlying condition, treating that condition is the key priority. In more severe cases, a doctor may prescribe blood pressure-raising medications such as etilefrine or midodrine.

When to see a doctor

Medical evaluation is recommended in the following situations:

Frequent episodes of fainting or falls
Rapid heartbeat or chest pain
Sudden, severe dizziness without explanation
Low blood pressure combined with fever, vomiting, or diarrhea
Persistent symptoms despite lifestyle adjustments

References

Freeman R et al. - Consensus statement on the definition of orthostatic hypotension, neurally mediated syncope and the postural tachycardia syndrome. Clinical Autonomic Research, 21(2):69-72, 2011. PubMed PMID: 21431947.
Lahrmann H et al. - Orthostatic hypotension. Handbook of Clinical Neurology, 117:469-476, 2013. PubMed PMID: 24095143.
World Health Organization (WHO) - Cardiovascular diseases: Key facts and prevention. Geneva, 2023. Available at: https://www.who.int/health-topics/cardiovascular-diseases

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