Medicine
Giddiness
A feeling of dizziness, unsteadiness, or lightheadedness, which can sometimes be a warning sign of a heart rhythm problem.
Dizziness and syncope (fainting) have a broad range of causes — from benign vasovagal episodes to life-threatening cardiac arrhythmias. Structured specialist assessment determines underlying causes and guides appropriate treatment.
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While giddiness can result from minor issues like dehydration, it is crucial to investigate potential cardiovascular causes such as arrhythmias or low blood pressure.
Giddiness: A Symptom, Not a Diagnosis
‘Giddiness’ covers several quite different sensations, and separating them is the first step to finding the cause.
A light-headed, about-to-faint feeling usually means the brain is briefly short of blood — that is the cardiovascular kind and the one we focus on. A spinning sensation (vertigo) is nearly always the inner ear. Feeling unsteady on your feet points to balance or nerve problems, and a vague woozy or floating feeling is often anxiety, a medication effect, or a low blood sugar. Telling us exactly what it feels like narrows the field enormously.
A light-headed, about-to-faint feeling usually means the brain is briefly short of blood — that is the cardiovascular kind and the one we focus on. A spinning sensation (vertigo) is nearly always the inner ear. Feeling unsteady on your feet points to balance or nerve problems, and a vague woozy or floating feeling is often anxiety, a medication effect, or a low blood sugar. Telling us exactly what it feels like narrows the field enormously.
Fainting: The Three Broad Causes
A faint (syncope) is a brief loss of consciousness from a temporary drop in blood flow to the brain. It falls into three groups, and they differ hugely in risk.
- Reflex (vasovagal) syncope — the commonest and usually benign; triggered by standing a long time, heat, pain, the sight of blood, or straining, with warning symptoms of nausea, warmth and tunnel vision, then quick recovery
- Orthostatic hypotension — blood pressure falls on standing up, from dehydration, blood-pressure or prostate medication, ageing, or nerve damage
- Cardiac syncope — the highest-risk kind, from an abnormal rhythm or a structural problem such as severe aortic stenosis; often sudden, with little or no warning, and sometimes during exertion
The Red Flags: When a Faint Needs Urgent Review
Most faints are harmless, but certain features raise the priority sharply.
- A faint during exercise or exertion
- A faint preceded by palpitations or chest pain, or with no warning at all
- A faint that caused a significant injury
- An abnormal ECG, known heart disease, or a family history of sudden death before 50
- Dizziness with weakness, slurred speech, double vision or a severe headache — this suggests a stroke; call 995
Getting to the Cause in Singapore
The history does most of the work — what you were doing, any warning symptoms, how quickly you recovered, and what any witnesses saw.
From there we do a 12-lead ECG and lying and standing blood pressures, an echocardiogram to check the heart's structure, and, to catch an intermittent rhythm, an ambulatory monitor — a Holter, a patch, or a small implantable loop recorder for infrequent episodes. A tilt-table test helps confirm reflex syncope. Blood tests check for anaemia and glucose problems. Where vertigo is likely, an ENT assessment is arranged. This work-up is available at Paragon Medical Centre on Orchard Road.
From there we do a 12-lead ECG and lying and standing blood pressures, an echocardiogram to check the heart's structure, and, to catch an intermittent rhythm, an ambulatory monitor — a Holter, a patch, or a small implantable loop recorder for infrequent episodes. A tilt-table test helps confirm reflex syncope. Blood tests check for anaemia and glucose problems. Where vertigo is likely, an ENT assessment is arranged. This work-up is available at Paragon Medical Centre on Orchard Road.
Treatment: Matched to the Cause
There is no single treatment for giddiness — it depends entirely on which mechanism is found.
- Reflex (vasovagal) syncope — learn to recognise the warning signs and lie down with the legs raised, or use counter-pressure manoeuvres such as crossing the legs and tensing them; increase fluid and salt, review blood-pressure-lowering medication, and consider compression stockings. A pacemaker helps the small number with documented long pauses
- Orthostatic hypotension — rehydrate, adjust the responsible medications, stand up slowly, raise the head of the bed, and use compression garments
- Cardiac syncope — treat the rhythm (a pacemaker for a slow heart, an ICD for a dangerous fast one, or an ablation) or the structural problem, such as replacing a tight valve
Everyday Precautions, and Driving
At the first warning — a wave of heat, nausea, greying vision — sit or lie down straight away and raise your legs; a faint that happens while you are already down cannot hurt you. Stand up slowly, especially from bed or a hot shower, and keep well hydrated in Singapore's heat.
Until the cause is known and controlled, do not drive, swim alone, or work at height, and be aware that there are licensing rules after an unexplained blackout. The reassuring part is that once reflex syncope is understood, the long-term outlook is excellent, and even cardiac causes are usually very treatable once identified.
Until the cause is known and controlled, do not drive, swim alone, or work at height, and be aware that there are licensing rules after an unexplained blackout. The reassuring part is that once reflex syncope is understood, the long-term outlook is excellent, and even cardiac causes are usually very treatable once identified.
Giddiness: Common Questions
Concerned About Giddiness?
Dr. Peter Chang offers specialist assessment and personalised management at Paragon Medical Centre, Singapore.