Presyncope is the feeling that you are about to faint while you are still conscious. People often call it “feeling faint” or “nearly blacking out”. Someone might say the room has gone dim, their hearing seems distant, or their legs suddenly feel unreliable. They can still answer you, even though they may need help getting safely to the ground. Listen to the person’s own description, because it can help the next clinician understand how this episode differed from ordinary tiredness or vertigo.
The distinction matters: syncope means a brief loss of consciousness; presyncope means that loss has not happened. Staying awake does not tell you why it occurred or prove that it is harmless.
What might a person notice?
Light-headedness, nausea, weakness, sweating, greying or tunnel vision, and a change in skin colour can occur. The person may become quiet, reach for support or ask to sit down. If they say “I feel dizzy”, ask what they mean. Spinning or poor balance can have different causes; the sense of being about to pass out is the clue to presyncope.
Imagine someone standing in a warm community hall who says, “I can hear you, but I think I might black out.” The useful response is to help them down and watch what happens next. It is not to decide on the spot that heat or dehydration must be the explanation.
Help them avoid a fall
- Help the person lie flat if it is safe and comfortable to do so. If they cannot lie down immediately, help them get low and supported. Do not ask them to walk to another room while they still feel faint.
- Stay with them and observe. Note whether they remain responsive, whether their breathing changes, and whether symptoms settle or return. Check for an injury if they fell.
- Raise the legs above heart level if it is safe to do so. ANZCOR says this may give temporary relief. Avoid moving an injured person in a way that could worsen an injury.
- Arrange help if symptoms persist. ANZCOR advises sending for an ambulance when the signs do not settle with first aid measures.
For a person who is alert and able to cooperate, ANZCOR also recommends physical counter-pressure manoeuvres to relieve symptoms. Examples include firmly tensing leg or arm muscles, hand gripping or crossing the legs and tensing them. These are brief measures while the person is safe and supported. They are not a reason to keep someone standing when they are close to collapsing, or to postpone emergency care when something is wrong.
When is it urgent?
Call Triple Zero (000) if the person becomes unresponsive, has chest pain, severe breathing trouble, appears seriously ill, or the faint feeling does not settle. A sudden episode during exertion, a worrying irregular heartbeat, significant bleeding or an injury after a fall also warrants prompt medical attention. Tell the call-taker what you have observed; follow their instructions.
If the person becomes unresponsive and is not breathing normally, start CPR and use an AED if one is available. If they are unconscious but breathing normally, follow current first aid guidance for an unresponsive breathing person and keep checking their breathing. The response has changed from near-fainting to a different emergency at that point.
What could cause it?
A simple fainting episode may be triggered by pain, emotional stress or standing in heat, and symptoms may improve when the person lies down. Other possibilities include medicine effects, blood loss, dehydration, heart problems, heat illness or serious infection. A first aider cannot reliably separate these causes from the sensation alone. A low blood pressure reading, if one is taken, is only one observation; it is not a diagnosis.
Even if the person feels better in a few minutes, a new, repeated or unexplained episode deserves medical advice. It is especially important to mention chest pain, palpitations, known heart disease, a recent illness, new medicines, pregnancy, or a family history of heart problems. Someone who actually lost consciousness should be assessed as a faint or blackout, rather than having the event recorded as presyncope.
What should you tell the next person caring for them?
A brief timeline is more useful than a guess. Record what the person was doing when it began, their own words for the feeling, whether they stayed awake, any fall or injury, what you observed and what first aid you gave. For example: “Felt faint while standing at 10:15; remained awake and talking; lay down; symptoms eased after five minutes.” Add any measured observations only if you are trained and have the equipment. Avoid writing “low blood pressure caused it” unless a clinician has established that cause.
Related terms: Fainting, Dizziness and Vertigo.
Sources reviewed
This entry is general education, not a diagnosis or a substitute for accredited first aid training. In an Australian emergency, call Triple Zero (000).
