What should you know about exercise induced syncope?

Fainting happens when the brain briefly receives too little blood flow. Exercise, abrupt stopping, overheating, dehydration, missed food, or illness can contribute. Anaemia, Hypoglycaemia, and Dehydration are possible medical explanations; an abnormal heart rhythm such as Atrial Fibrillation is another reason a clinician may investigate the event.

Details matter: fainting during exertion is different from feeling faint after stopping. Tell the clinician about warning symptoms, palpitations, chest discomfort, breathlessness, injury, medicines, family history, and whether anyone saw shaking or a prolonged recovery.

Stop activity, lie flat, and raise the legs if safe. Turn the person on their side if they are unconscious and breathing, protect them from injury, and do not give food or drink until fully alert. Avoid driving, swimming alone, heights, and strenuous exercise until assessed.

Book prompt medical care after any exercise-related blackout, even if recovery was quick. A clinician may review blood pressure, heart rhythm, blood tests, and the circumstances surrounding the episode.

Call emergency services if the person does not wake promptly, has trouble breathing, chest pain, a persistent irregular heartbeat, a serious injury, seizure-like activity, or repeated fainting. Urgent help is also needed when fainting occurs without warning or during exertion.

Ask what tests are needed, when activity can restart, whether medicines or hydration need review, and which symptoms should trigger emergency help.