Light-headedness

Light-headedness is a feeling that you may faint or lose steadiness, rather than a clear spinning sensation. It can occur with dehydration, changes in blood pressure, heart rhythm problems or other conditions. Recurrent episodes, actual fainting or symptoms during exercise need assessment, even if you recover quickly.

What should I do when it happens?

Sit or lie down somewhere safe to reduce the chance of falling. Avoid driving, climbing or operating machinery while affected. If you are alone and feel you may collapse, contact someone who can help. Do not force yourself to keep standing to complete a task.

Note whether it happens after standing, during exertion, around meals or with illness. Tell the clinician about bleeding, poor intake, pregnancy possibility, palpitations and recent treatment changes. Describe any actual loss of consciousness and whether someone witnessed it.

For the Australian guidance behind this explanation, see Healthdirect Australia: Fainting - treatments, symptoms, causes and prevention | healthdirect.

How is it investigated?

A doctor may check blood pressure in different positions, pulse, heart rhythm and other findings. Tests depend on the history rather than a single standard panel. A home reading can be useful, but it does not replace assessment if symptoms are concerning.

Ask whether any current medicines might contribute, but do not stop them without advice. Repeated unexplained episodes need follow-up even when each one settles. Telehealth can help organise the history, while examination or an ECG may be needed to assess circulation or rhythm.

When should I seek emergency help?

Call 000 for light-headedness with chest pain, severe breathlessness, major bleeding, new weakness, speech changes or collapse. Fainting during exercise or while sitting or lying down also needs urgent assessment. A sudden severe headache or persistent confusion is concerning. Do not assume anxiety or dehydration is the explanation without considering the full symptom pattern and obtaining appropriate care.

Where to go next

Read online doctor consultations to understand the relevant service. A doctor decides whether a consultation, examination, referral or another pathway is appropriate for your situation.