What should you know about fainting in public?

Heat, queues, crowding, stress, pain, missed meals, and standing still can make faintness more likely. Warning signs may include sweating, nausea, weakness, tunnel vision, or a feeling that sounds are becoming distant. These signs can occur before a reflex faint, but fainting in public can also reflect dehydration, anaemia, low blood sugar, or an irregular heartbeat such as atrial fibrillation. The setting does not explain the cause by itself.

Tell a staff member or trusted person that you may faint. Sit on the floor or lie down away from traffic, stairs, water, and hot surfaces; do not try to reach a private place alone. A bystander should protect your head, check breathing, and call emergency services if you do not recover promptly. Food or drink should wait until you are fully awake. Afterward, stay with someone, stand slowly, and arrange a safe journey home or medical review.

Call emergency services for chest pain, severe breathlessness, abnormal breathing, a serious injury, prolonged unconsciousness, persistent confusion, or new weakness or speech difficulty. Seek medical assessment after a first faint, repeated episodes, fainting during exercise, fainting without warning, or collapse while sitting. Avoid driving until the cause has been assessed.

Could heat, meals, fluids, medicines, blood pressure, anaemia, or heart rhythm be involved? What should I do at the first warning sign? Do I need tests before returning to driving, work at height, or solitary travel?