Syncope is a brief loss of consciousness from transiently reduced blood flow to the brain, followed by spontaneous recovery. Dizziness is broader and may describe imbalance, vertigo or near-fainting.
Why the Symptom Pattern Matters
- Fainting after prolonged standing, heat, pain or emotion with warning symptoms often suggests a reflex mechanism.
- Fainting during exertion, while lying down or with sudden palpitations is more concerning for a cardiac cause.
- Standing-related symptoms may reflect orthostatic blood-pressure fall.
- Prolonged confusion, tongue injury or focal weakness may suggest a neurological cause.
Possible Causes
This list explains possibilities; the symptom alone cannot establish a diagnosis.
- Reflex or vasovagal syncope
- Orthostatic hypotension or volume loss
- Fast or slow arrhythmia
- Aortic stenosis, cardiomyopathy or pulmonary embolism
- Neurological, vestibular or metabolic disorders
What the Clinician Will Assess
- Circumstances, posture, warning, duration and recovery
- Witness description and injury
- Family sudden death and structural heart disease
- Lying and standing blood pressure, ECG and cardiovascular examination
Which Tests May Be Considered?
Not every test is required for every person. Selection depends on examination findings and clinical probability.
- ECG for every suspected syncope assessment
- Echocardiography when structural disease is possible
- Monitor duration matched to event frequency
- Tilt testing or neurological assessment in selected cases
What to Record Before the Appointment
- Posture and activity at onset
- Warning symptoms and pulse
- Witness video or description when safely available
- Medicine changes, fluid loss and illness
When to Call Emergency Services
Do not wait for an online reply
- Fainting during exercise
- Fainting with chest pain, breathlessness or sustained palpitations
- New neurological deficit or prolonged confusion
- Known severe heart disease or family sudden death
- Failure to recover promptly
Frequently Asked Questions
Is every faint a heart problem?
No, but cardiac causes are important to identify because risk differs.
Does a normal short Holter exclude arrhythmia?
No, particularly if no event occurred during recording.
Can I drive after fainting?
Driving restrictions depend on cause and recurrence risk; obtain individual medical and legal advice.
Medical information note
This page provides general information and does not replace examination, diagnosis or an individual treatment plan.