What should you know about fainting causes in adults?

Adults may faint after standing suddenly, prolonged standing, pain, fear, heat, or straining. Blood pressure medicines and other prescriptions can sometimes contribute, especially when combined with poor fluid intake. Dehydration from sweating, vomiting, or diarrhoea can reduce blood volume. Low blood sugar is more relevant when meals are missed or diabetes treatment affects glucose. Anaemia can cause tiredness and light-headedness, and heart rhythm changes such as Atrial Fibrillation need medical review. The circumstances and recovery pattern are as useful as the blackout itself.

At the first warning, sit or lie down so you do not fall. Afterward, rest in a cool place and rise gradually. If you are alert, drink fluids and have food if you have not eaten. Do not drive, climb, or operate machinery until the cause has been assessed. Bring a list of medicines and describe the episode to a clinician, including posture, symptoms, witnesses, injury, and recovery.

Seek emergency help for fainting with chest pain, breathing difficulty, severe headache, confusion, one-sided weakness, seizure-like movements, or a significant injury. Fainting during exercise, while lying down, or with palpitations is concerning. Emergency assessment is also appropriate if consciousness does not return promptly or the person cannot swallow safely.

Ask which checks are appropriate for blood pressure, heart rhythm, blood count, glucose, and medicines. Ask how to reduce fall risk while waiting for an explanation and whether recurrent dizziness changes your review plan.