Lightheadedness and fainting: what should you know?

Standing quickly, heat, dehydration, pain, anxiety, missed meals, or Hypoglycaemia can trigger symptoms. Anaemia and Iron Deficiency Anaemia may reduce oxygen delivery. A spinning sensation can occur with Benign Paroxysmal Positional Vertigo, whereas an irregular heartbeat such as Atrial Fibrillation can cause palpitations or weakness and needs medical review.

The timing matters: note whether symptoms followed standing, exertion, heat, a meal, emotional stress, or a head movement. Fainting during exercise, without warning, or with heart symptoms is more concerning than a brief episode after standing.

Lie flat and raise your legs if possible. Loosen tight clothing, stay still until the feeling passes, and ask someone to remain with you. After fainting, check for injury and do not stand suddenly. Once fully alert, drink water and eat if you have missed a meal and can swallow safely.

Arrange a medical review after fainting, a first episode, repeated lightheadedness, or an episode that caused injury. Bring details of medicines, illness, fluid intake, and family history of heart problems.

Call emergency services for chest pain, trouble breathing, severe or irregular palpitations, a seizure-like episode, prolonged confusion, one-sided weakness, speech difficulty, severe headache, heavy bleeding, serious injury, or fainting during exercise. Urgent assessment is also needed if the person is pregnant, has diabetes, or does not recover promptly.

Ask what trigger is most plausible, whether blood pressure, blood tests, or heart monitoring is needed, how to prevent another episode, and which symptoms should send you to emergency care.