Call 999 when someone’s life is at risk or a serious crime is happening right now. That covers cardiac arrest, choking, heavy bleeding, stroke, breathing difficulties, severe allergic reactions, poisoning, and situations where someone faces immediate violence or danger. If you’re unsure whether your situation counts, NHS 111 can assess your symptoms and tell you whether you need emergency services.
Medical Emergencies That Need 999
The clearest reason to call 999 is when someone is unconscious and not breathing. Start CPR immediately while waiting for the ambulance. Beyond that core scenario, several conditions require an emergency response because delays of even a few minutes can cause permanent damage or death.
Call 999 for any of the following:
- Cardiac arrest or suspected heart attack. Chest pain, tightness, or pain spreading to the arms, jaw, neck, or back. Sit the person upright and keep them comfortable while you wait.
- Stroke. Use the FAST test: Face drooping on one side, Arm weakness (can they raise both arms?), Speech slurred or garbled, Time to call 999 immediately.
- Severe breathing difficulty. Gasping, inability to speak in full sentences, or skin turning blue around the lips.
- Heavy bleeding. Any wound where blood is flowing fast or won’t stop with firm pressure.
- Anaphylaxis. A severe allergic reaction causing swelling of the throat, difficulty breathing, or collapse.
- Choking. If back blows and abdominal thrusts haven’t cleared the airway, call 999 and tell the operator the person is choking.
- Poisoning or overdose. Whether accidental or intentional, call 999 if someone has swallowed a toxic substance.
- Shock. Cold, clammy skin, rapid breathing, confusion, or fainting after an injury or illness.
Red Flags in Babies and Children
Children can deteriorate quickly, so the threshold for calling 999 is lower than for adults. Call immediately if a child stops breathing, has rapid panting breaths, or is sucking their stomach in under their ribs with each breath. A seizure lasting longer than five minutes, or more than one seizure within five minutes, also needs an emergency response.
Other warning signs include a high temperature with a stiff neck or severe headache, skin that looks pale, blotchy, blue, or grey, and a rash of purple or red spots that doesn’t fade when you press a glass against it (the “glass test”). A child who is unusually floppy, extremely difficult to wake, or crying in a way that sounds nothing like their normal cry should also be treated as an emergency. Trust your instincts. If something feels seriously wrong, call.
Mental Health Crises
Mental health emergencies are valid reasons to call 999. The NHS advises calling if someone’s life is at risk, for example if they’ve seriously injured themselves or taken an overdose, or if you don’t feel you can keep yourself or someone else safe. For urgent mental health support that isn’t immediately life-threatening, NHS 111 can connect you with crisis services, or you can request an urgent GP appointment.
Police and Fire Emergencies
999 connects you to police, fire, and ambulance services. For police, the standard is situations where there is, or is likely to be, a danger to life, a serious threat of violence, serious damage to property, or serious injury happening right now. That includes crimes in progress, someone breaking into your home while you’re inside, a road accident with injuries, or a fire.
For non-urgent police matters like reporting a crime that has already happened, use 101 instead. This keeps 999 lines clear for emergencies.
If You Can’t Speak on the Call
If you’re in danger and making a sound would put you at risk, there’s a system called Silent Solution. After dialling 999, your call will be transferred to an automated message that begins with “you are through to the police.” It will ask you to press 55 on your keypad. Pressing 55 confirms you need help and connects you to police call handlers, who will try to communicate using simple yes-or-no questions. If you don’t press 55, the call will be ended. The BT operator stays on the line throughout, listening for any indication you need help.
What Happens When You Call
The operator will first ask which service you need: ambulance, police, or fire. For ambulance calls, the questions follow a set pattern. They’ll ask for the address of the emergency (a postcode helps enormously), the phone number you’re calling from, whether the patient is awake, whether they’re breathing, and then “tell me exactly what has happened.” They’ll also ask if you’re with the patient and how old they are. Before hanging up, they’ll take your name and date of birth.
You don’t need to have every detail. Give what you can and stay on the line. The operator may talk you through first aid steps like CPR or how to control bleeding while the ambulance is on its way. Don’t hang up until they tell you to.
If you’re calling from a mobile phone, your handset automatically sends location data to the operator through a system called Advanced Mobile Location. This pinpoints your position to within 5 to 50 metres using GPS or Wi-Fi, compared to the roughly 2-kilometre radius that mobile networks provide on their own. Both Android phones (since 2016) and iPhones (since 2018) support this. It works automatically, but you should still give a verbal address or description of your location, especially if you’re indoors or in a rural area. The what3words app can help identify your exact spot if you don’t know the street address.
How Quickly the Ambulance Arrives
Ambulance calls are sorted into categories based on severity. Category 1 covers the most critical emergencies, like cardiac arrest, where the national target is a 7-minute average response time, with 90% of calls answered within 15 minutes. Category 2 covers serious but slightly less time-critical conditions, like strokes and heart attacks, with a target average of 18 minutes (adjusted to 30 minutes for recent years) and 90% of calls within 40 minutes. For police, the target for immediate-grade calls is arrival within 15 minutes.
These are targets, not guarantees. Response times vary by location, time of day, and demand. Giving clear, accurate information on the call helps operators assign the right priority.
999 vs. 111 vs. 101
If your situation doesn’t feel life-threatening but still feels urgent, NHS 111 is the right call. You can check symptoms online at 111.nhs.uk or phone 111 to speak with someone. They’ll assess your situation and either reassure you, book you into an urgent care centre, or escalate to 999 if needed. For children under 5, calling 111 rather than using the online tool is recommended.
Use 101 for non-urgent police matters: reporting a crime after the fact, giving information about an incident, or general policing enquiries. The simple dividing line is whether someone is in danger right now. If yes, 999. If not, 111 for health concerns or 101 for police matters.