Fainting frequently: what should you do?

A faint may follow standing for a long time, heat, pain, fear, dehydration or a missed meal. Frequent episodes can also occur with anaemia, low blood sugar or a heart-rhythm problem such as Atrial Fibrillation. The pattern is more useful than the word frequent: note posture, activity, warning symptoms, injuries and recovery.

A clinician may review your medicines, pulse and blood pressure, then decide whether an ECG or blood tests are needed. Do not assume every episode has the same explanation, particularly if a new symptom appears.

At the first warning of light-headedness, lie down immediately or sit with your head lowered. Avoid driving, swimming alone, climbing and operating machinery until you have been assessed. Drink regularly and avoid skipping meals unless a clinician has given different instructions. Keep a record that another person can add to if they witness an event.

Tell people close to you how to help: keep you flat, check breathing, protect your head and avoid giving anything by mouth while you are unconscious.

Call emergency services if fainting happens with chest pain, breathlessness, severe palpitations, exercise, a major injury, pregnancy, prolonged unresponsiveness or a new one-sided weakness. Arrange prompt medical review for repeated unexplained fainting, fainting without warning, or an episode while sitting or lying down.

Ask what triggers are most plausible, whether your medicines or fluid intake could contribute, and whether you need an ECG, blood tests or monitoring. Bring your episode record and ask when it is safe to drive, work at height or exercise.