Fainting in the morning: what to know

Warning symptoms can include light-headedness, blurred vision, nausea, sweating, warmth, or weakness. Anaemia can reduce oxygen delivery and contribute to dizziness; dehydration can reduce circulating fluid; hypoglycaemia can occur when blood sugar falls, especially after missed meals or diabetes treatment. Atrial Fibrillation and other rhythm changes can cause palpitations or faintness and need medical assessment.

Lie flat and raise your legs if possible. Stay there until you feel fully alert, then sit up slowly before standing. Do not drive, climb, or bathe alone while dizzy. Drink fluids if you can swallow safely, eat a usual meal if you have missed one, and record what happened, including your position, symptoms, medicines, food, and fluid intake. Arrange a clinical review after any unexplained faint.

Call emergency services if the person does not wake promptly, has trouble breathing, chest pain, a severe headache, new weakness, confusion, a serious injury, or repeated episodes. Urgent assessment is also needed when fainting happens during exercise, while lying down, or with a fast or irregular heartbeat. Seek same-day advice for a first episode, pregnancy, diabetes, known heart disease, or ongoing dizziness.

Ask whether your blood pressure should be checked lying and standing, whether an electrocardiogram is appropriate, and whether blood tests for anaemia or glucose could help. Bring a medicine list and describe breakfast, hydration, sleep, and any palpitations before the episode.