When to Call 999: Recognising a True Medical Emergency

The purpose of 999

The 999 ambulance service exists for one thing: getting emergency medical help to people whose lives are at immediate risk or who are suffering a condition where rapid treatment changes the outcome. Every call uses shared resources — ambulances, paramedics, dispatchers — so understanding when 999 is appropriate protects both you and others who may need those resources at the same time.

This guide covers the symptoms and situations where 999 is the right call, the situations where a different service is better, and what happens after you dial.

Always call 999 for these symptoms

Chest pain

Chest pain is the single most common reason for 999 calls, and for good reason. Heart attacks are time-sensitive emergencies where every minute of delay reduces the chance of a good outcome. Call 999 if you or someone with you has:

• Crushing, squeezing or heavy pressure in the centre of the chest
• Pain that spreads to the jaw, neck, shoulder, arm or back
• Chest pain combined with sweating, nausea, breathlessness or dizziness
• Chest pain in someone with known heart disease

While waiting for the ambulance, have the person sit down in a comfortable position (usually leaning slightly forward) and give them a 300 mg aspirin to chew if available and they are not allergic. Our chest pain guide covers the full range of chest pain causes and how to tell the serious from the benign.

Stroke symptoms (FAST)

A stroke happens when blood supply to part of the brain is cut off. Treatment within hours can dramatically reduce permanent damage. Use the FAST test:

• Face — has the face fallen on one side? Can they smile?
• Arms — can they raise both arms and keep them there?
• Speech — is their speech slurred or garbled? Can they speak a full sentence?
• Time — if you see any of these signs, call 999 immediately

Do not drive the person to hospital yourself. Ambulance crews alert the stroke team en route, so the right specialists are assembled and ready when the patient arrives.

Breathing difficulty

Call 999 if someone:

• Cannot speak in full sentences because they are too breathless
• Is turning blue around the lips, fingertips or face
• Is breathing very fast and working hard — using neck and stomach muscles to breathe
• Has stopped breathing or is only gasping
• Has a known condition like asthma and their reliever inhaler is not working after repeated doses

Severe bleeding

Call 999 if:

• Blood is spurting from a wound (arterial bleeding)
• Bleeding cannot be controlled with direct pressure after 10 minutes
• The person is becoming pale, cold, sweaty or confused — signs of significant blood loss
• The wound is deep and involves the neck, chest or abdomen

While waiting, apply firm pressure to the wound with a clean cloth and do not remove it. If blood soaks through, add another layer on top.

Unconsciousness or collapse

Call 999 if someone:

• Has collapsed and is not responsive — they do not react to your voice or to being gently shaken
• Is having a seizure lasting more than five minutes, or has repeated seizures without recovering between them
• Has collapsed after a known allergic exposure (anaphylaxis) — give their adrenaline auto-injector if available, then call 999
• Is unconscious after a head injury — see our head injury guide for the full spectrum of severity

Severe allergic reactions (anaphylaxis)

Symptoms escalate rapidly and include:

• Swelling of the throat, tongue or face
• Difficulty breathing or swallowing
• Feeling faint, dizzy or collapsing
• A rapid, widespread rash or hives

If the person has an adrenaline auto-injector (EpiPen), help them use it immediately, then call 999 even if symptoms seem to improve — a second reaction can occur.

Suspected poisoning or overdose

Call 999 if someone has taken an overdose of medication, ingested a toxic substance, or is showing signs of poisoning (confusion, vomiting, drowsiness, breathing changes). Even if the person seems fine initially, some substances have delayed effects. Do not try to make them vomit.

Major trauma

Call 999 for:

• Road traffic collisions with significant impact
• Falls from height (generally more than twice the person's own height)
• Stab wounds or gunshot injuries
• Crush injuries
• Near-drowning

When 999 is not the right call

The following conditions are urgent but not emergencies. They need medical attention today but do not require an ambulance:

• Sprains, simple fractures and minor injuries — drive or get a lift to a UTC or A&E, or call 111
• Moderate abdominal pain without signs of severe illness
• Fever in an adult who is alert, drinking and oriented
• Chronic conditions that have worsened but are not acutely dangerous
• Minor burns — small, superficial burns that are painful but not on the face, hands, feet or genitals
• Dental emergencies — call 111 for an out-of-hours dentist
• Non-emergency mental health distress — call your crisis team, Samaritans (116 123), or 111 — see our mental health crisis guide

What happens when you dial 999

The call

A dispatcher answers and asks a series of structured questions: Is the patient breathing? Are they conscious? What happened? Where are you? The dispatcher uses your answers to categorise the call and assign a response.

Stay on the line. The dispatcher may give you life-saving instructions while the ambulance is on its way — CPR guidance, advice on controlling bleeding, how to position an unconscious person in the recovery position. Follow their instructions carefully.

The ambulance arrives

Paramedics carry equipment for advanced life support: defibrillators, oxygen, intravenous medications, splints and stretchers. They will assess the patient rapidly and begin treatment on scene. They may:

• Stabilise the patient and transport to hospital
• Treat on scene and advise that hospital is not needed (this is more common than many people expect)
• Call for additional resources — a specialist car, an air ambulance, or a second crew

At hospital

If you are transported to A&E, the paramedics provide a clinical handover to the hospital team. This means your information — observations, history, treatment given — is passed directly to the receiving nurse or doctor. You do not go through the standard waiting-room queue; you are taken directly into the department.

Teaching children to call 999

Children as young as four can learn to dial 999. Teach them:

• When to call: "If mummy or daddy falls down and won't wake up"
• What to say: their name, address, and "someone is very poorly"
• To stay on the phone and answer questions

This simple training has saved lives in cases where a parent has collapsed at home with a child present.

What if I am not sure?

Uncertainty is normal. The general principle is simple: if you think it might be an emergency, call 999. Dispatchers are trained to assess the situation over the phone and will tell you if a different service is more appropriate. You will never be penalised for calling in good faith.

Some people hesitate because they worry about wasting ambulance time. While it is true that ambulance services are under pressure, the risk of delaying a genuine emergency far outweighs the cost of a call that turns out to be non-urgent. Dispatchers deal with uncertain callers every shift — it is part of the job, and they would rather you called than not.

If your situation is urgent but you are reasonably certain it is not an emergency — for example, a suspected fracture with no deformity, or abdominal pain that is uncomfortable but not severe — 111 is the better first call. The 111 service can assess whether you need an ambulance or whether another route is faster.

After calling 999

While waiting for the ambulance:

• Stay on the phone with the dispatcher — they may give you life-saving instructions
• Clear a path for the paramedics — unlock the front door, turn on lights, move furniture out of the way
• If possible, have someone wait outside to flag down the ambulance, especially if your property is hard to find
• Gather the patient's medication if time allows — paramedics find this information valuable
• Keep pets away from the entrance
• Do not give the patient food, drink or medication unless the dispatcher specifically tells you to (aspirin for suspected heart attack is the main exception)

Bottom line

Call 999 for chest pain, stroke symptoms, severe breathing difficulty, heavy uncontrollable bleeding, unconsciousness, anaphylaxis, suspected poisoning, and major trauma. For everything else, consider 111, your local A&E or UTC, or your GP. When in doubt, it is always better to call and be told it is not an emergency than to delay a call that was genuinely needed. Check live A&E wait times once you know which hospital you are heading to.