Low Blood Pressure Symptoms

Common Low Blood Pressure Symptoms

Common symptoms of low blood pressure are listed below:

• Dizziness or light-headedness

• Blurred or fading vision

• Fainting

• Weakness

• Tiredness

• Nausea

• Confusion

• Difficulty concentrating

Some people have naturally low blood pressure and feel completely well. In such cases, a low reading may not require treatment unless symptoms or another medical problem are present.

Low Blood Pressure Symptoms That Should Not Be Ignored

Persistent, recurrent or worsening symptoms should be medically assessed, especially when they interfere with daily activities or occur after a sudden fall in blood pressure.

The table below highlights symptoms that should not be ignored and what they may indicate:

Dizziness, weakness and fainting can also occur with many other conditions, so symptoms should not be attributed to low blood pressure without appropriate assessment.

Why Does Low Blood Pressure Occur?

Low blood pressure usually develops when the force of blood flowing through the blood vessels becomes too low. In adults, a blood pressure reading below 90/60 mmHg is commonly considered low. This can reduce blood flow to the brain and other vital organs. This reduced blood flow to the brain can cause dizziness, light-headedness, blurred vision, difficulty concentrating or fainting.

Blood pressure can fall for many reasons. Dehydration or significant blood loss reduces the amount of circulating blood, while some heart conditions reduce how effectively blood is pumped around the body. Pregnancy, certain medicines, hormone-related conditions, severe infection and serious allergic reactions can also lower blood pressure.

Symptoms may become more noticeable when blood pressure drops suddenly, such as after standing up. Heat, prolonged standing, dehydration and meals can also trigger symptoms in susceptible people.

Low Blood Pressure Symptoms That Require Immediate Medical Attention

A mildly low blood pressure reading is not usually an emergency by itself. However, a severe or sudden drop can lead to shock, where vital organs do not receive enough blood and oxygen.

It is recommended to get immediate medical attention for:

• Loss of consciousness or difficulty waking

• Severe confusion or disorientation

• Cold, pale or clammy skin

• Rapid, shallow breathing

• A weak, rapid pulse

• Severe difficulty breathing

• Sudden severe weakness following major blood loss

• Severe dizziness or fainting with chest pain

• Low blood pressure accompanied by signs of a severe allergic reaction

• Severe illness with worsening confusion, weakness or breathing problems

Symptoms of Low Blood Pressure Based on Type

Low blood pressure can occur in several recognised patterns. How and when these symptoms happen can often help doctors understand what is causing your low blood pressure.

The table below summarises the main types of low blood pressure and their typical symptoms:

Orthostatic hypotension is generally defined as a sustained fall of at least 20 mmHg in systolic blood pressure or 10 mmHg in diastolic pressure within three minutes of standing.

Postprandial hypotension is particularly recognised in older adults and people with conditions affecting autonomic blood-pressure control.

Low Blood Pressure Symptoms in Children

Children with low blood pressure can develop symptoms similar to those seen in adults. However, blood-pressure values in children need to be interpreted according to age, size and clinical circumstances rather than relying on the adult 90/60 mmHg threshold.

Low blood pressure symptoms in children may include:

• Dizziness or light-headedness

• Fainting or temporary loss of consciousness (syncope)

• Extreme fatigue, weakness or unusual tiredness

• Blurred or dimming vision

• Nausea or abdominal discomfort

• Difficulty concentrating or confusion

• Pale, cool or sweaty skin during severe hypotension

• Rapid breathing or a weak pulse in severe cases

• Irritability or sudden behavioural changes

Neurally mediated fainting and other forms of orthostatic intolerance are particularly relevant in children and adolescents. Symptoms may be triggered by prolonged standing, heat, dehydration or physical stress.

A child who faints repeatedly or develops severe weakness, breathing difficulty, confusion or signs of poor circulation requires medical assessment.

Can You Have Low Blood Pressure Without Symptoms?

Yes. Low blood pressure can occur without any noticeable symptoms. Some people naturally have readings below 90/60 mmHg and remain completely well.

Whether a low reading is concerning depends on the person's usual blood pressure, symptoms, medicines, medical history and how quickly the pressure has fallen. A sudden drop accompanied by dizziness, fainting or confusion is generally more significant than a consistently low reading in someone who feels well.

When Can Low Blood Pressure Symptoms Become Life-Threatening?

Low blood pressure can become life-threatening when it falls far enough to prevent vital organs from receiving adequate blood and oxygen. This can occur with shock caused by major blood loss, severe infection, a serious allergic reaction or significant heart problems.

The table below highlights symptoms that may indicate a serious low blood pressure:

How are Low Blood Pressure Symptoms Diagnosed?

Low blood pressure is assessed by measuring blood pressure and considering whether symptoms occur at the same time. Further tests may be used to identify the underlying cause.

The table below summarises common diagnostic assessments:

In adults, a blood pressure below 90/60 mmHg is commonly considered low. However, a single low reading does not necessarily indicate a medical problem, particularly if the person has no symptoms.