Some links on this page have been colour coded to make it easier to find the information you need:
The NHS very simply set out when you should call 999 or go to A&E (We recommend everyone becomes familiar with their list)
Below in the frequently asked questions we go into much more detail so you can understand some of the serious conditions and key symptoms which could indicate an emergency.
If you are not sure you can call 111: When to use 111 When to use NHS 111 – NHS
As the NHS suggest
In some situations such as a heart attack, stroke, or major trauma as examples. “Every second counts with these conditions.” When to call 999 – NHS . Also an ambulance can ensure that you are taken to the correct place such as a stroke centre.
Importantly calling a GP practice when you potentially have a very serious condition can just delay your treatment. Remember if you are not sure you can call 111 and they can advise you where you should go – When to use 111 When to use NHS 111 – NHS
For full details see under
If you are not sure whether you should call 999 (or go to A&E) or instead ask for an urgent GP appointment then 111 can advise you
As the NHS suggests
NHS 111 can help if you think you need medical help right now
These are cover separately under
The purpose of this section is to cover some of the common serious conditions divided up by symptoms and signs. If you might have any of these serious conditions then you should act immediately. This is not an exhaustive list so if you are not sure call 111.
As the NHS points out
“Call 999 for an ambulance if someone suddenly becomes confused. Many of the causes of sudden confusion need assessment and treatment as soon as possible. In some cases, it may be life threatening.”
Also consider confusion after a head injury as a reason to call 999
As the NHS suggests after a head injury
“Symptoms of a subdural haematoma can include:
The symptoms can develop soon after a severe head injury (acute subdural haematoma), or very occasionally a few days or weeks after a more minor head injury (subacute or chronic subdural haematoma).”
If you develop the symptoms above any time after a minor head injury, you should also go to your nearest A&E department or call 999 for an ambulance as soon as possible.” Subdural haematoma Subdural haematoma – NHS
The NHS points out speech changes which can be found with a stroke or TIA
“Their speech may be slurred or garbled, or the person may not be able to talk at all despite appearing to be awake; they may also have problems understanding what you’re saying to them.”
If you think someone is having a stroke or TIA then call 999
As the NHS points out
You should call 999 for an ambulance if you know it’s their first seizure or it’s lasting longer than 5 minutes.
As the NHS suggests
“Call 999 for an ambulance if you or someone else has paralysis or weakness that:
As the NHS suggests with the weakness associated with a stroke
“Face – the face may have dropped on 1 side, the person may not be able to smile, or their mouth or eye may have dropped.
Arms – the person with suspected stroke may not be able to lift both arms and keep them there because of weakness or numbness in 1 arm.”
If you think someone is having a stroke or TIA then call 999
As the NHS suggests call 999
“Someone faints and they:
As the NHS suggests
“If you’re hurt or unable to get up, try to get someone’s attention by calling out for help, banging on the wall or floor, or using your personal alarm or security system (if you have one). If possible, crawl to a telephone and dial 999 to ask for an ambulance.” Falls Falls – NHS
Shortness of breath when combined with other symptoms or signs may indicate a serious condition. Some important examples included by NHS choices include:
Call 999 if
“You’re struggling to breathe or you have sudden shortness of breath and:
You could be having a heart attack or a problem with your lungs or airway. Call 999 immediately as you need treatment in hospital. Heart attack Heart attack – NHS
“The main symptoms of heart failure are:
Call 999 for an ambulance or go to your nearest A&E department as soon as possible if you have sudden or very severe symptoms.” Heart failure Heart failure – NHS
As the NHS suggests call 999
“If you have Heart palpitations (heartbeats that suddenly become more noticeable) and severe shortness of breath “
Call 999 or go to A&E if:
These could be signs of a pulmonary embolism or another serious condition.
“Call 999 for an ambulance if you or someone you care for:
Pneumonia Pneumonia – NHS
As the NHS suggests one of the symptoms of sepsis can be:
Call 999 if sepsis is a possibility.
For more information on sepsis see under Spotting Sepsis.
Call 999 for anaphylaxis for which symptoms might include “breathing difficulties – such as fast, shallow breathing and wheeze”
As the NHS suggests
“Anaphylaxis usually develops suddenly and gets worse very quickly.
The symptoms include:
There may also be other allergy symptoms, including an itchy, raised rash (hives); feeling or being sick; swelling (angioedema) or stomach pain.” Anaphylaxis Anaphylaxis – NHS
There are a number of common conditions relating to the chest which may need an emergency response including
Asthma (includes when to call 999) – Asthma – Asthma attacks – NHS
An overview of Shortness of breath including less serious causes of shortness of breath (such as panic attack) are included here: Shortness of breath Shortness of breath – NHS
Infections causing serious illness are not common but knowing what you are looking for can ensure you attend A&E at the right time.
The association of a high fever with other symptoms can indicate a serious condition as covered below.
As the NHS suggests for sepsis:
Call 999 if an adult or older child has any of these symptoms of sepsis:
For more information on sepsis see under Spotting Sepsis.
Some rare but important conditions always need an urgent response
When you should attend A&E is explained in more detail under each infection
Under and over Heating unrelated to infection
When to call 999 for
Pain in certain situations or when combined with other symptoms or signs may indicate an emergency response is needed and calling 999. Some important examples from NHS choices include:
As the NHS suggest
“Call 999 if you have sudden chest pain that:
As the NHS suggests call 999 “if you have Heart palpitations (heartbeats that suddenly become more noticeable) and chest pain or tightness “
As the NHS suggests after a head injury:
“Symptoms of a subdural haematoma can include:
As the NHS suggests
“a sudden severe headache unlike anything you’ve experienced before”, combined with some other symptoms may indicate a subarachnoid haemorrhage. These are expanded on here: Subarachnoid haemorrhage Subarachnoid haemorrhage – NHS
As the NHS suggests
“Symptoms of a ruptured brain aneurysm usually begin with a sudden agonising headache”. The other symptoms which may indicate a brain aneurysm are expanded on here: Brain aneurysm Brain aneurysm – Symptoms – NHS
The NHS provides an overview of serious symptoms and signs which indicate you should attend A&E : Headaches Headaches – NHS
This includes
Meningitis Meningitis – NHS
What symptoms might mean you have a serious cause for your abdominal pain and when should you call 999 or attend A&E rather than making an appointment with your GP. This is explained further here
As the NHS suggests
“Go to A&E immediately or call 999 if you have:
These can be signs of a serious problem that needs to be treated in hospital as soon as possible.” Testicle pain Testicle pain – NHS
As the NHS suggests
“Go to A&E or call 999 if you have back pain and
From Patient info
Cauda Equina Syndrome Cauda Equina Syndrome | Symptoms, Treatment and Recovery | Patient
Certain fractures should always be treated in A&E which is explained below
As the NHS suggests
“Always call 999 for very severe suspected breaks, such as a broken neck or back.”
“Go to your nearest A&E for a broken arm or leg. Call 999 for an ambulance if the injury to the leg seems severe or you’re not able to get to A&E quickly.”
As part of some conditions there can be skin changes (changes in colouring, swelling, or rashes) which can indicate with the other symptoms that an urgent assessment at A&E is needed
As the NHS suggests
“Call 999 or go to A&E if:
As Meningitis Now suggests
“People with septicaemia may develop a red rash of tiny ‘pin pricks’, which can develop into purple bruising. This rash does not fade under pressure.”
The skin changes of anaphylaxis on their own do not necessarily in themselves indicate a serious condition, it is the combination of the skin changes with the other symptoms of anaphylaxis (such as difficulty swallowing, difficulty in breathing and confusion) which can give the clue to anaphylaxis.
As the Anaphylaxis Campaign suggest the skin changes might include
From the NHS
Anaphylaxis Anaphylaxis – NHS
In the majority of cases cellulitis is treated just by your GP, but on occasions you should attend A&E. This is when the rash of cellulitis (examples shown in the article from NHS choices) is combined with other symptoms which may suggest sepsis.
As the NHS suggests:
“Call 999 or go to A&E now if you have cellulitis with:
In an ill person, call 999 if the skin changes of sepsis (highlighted below) occur
As the NHS suggests for sepsis:
Call 999 if an adult or older child has any of these symptoms of sepsis:
For more information on sepsis see under Spotting Sepsis.
Vomiting on its own does not necessarily indicate a very serious condition but on occasions when they are combined with other symptoms or signs this can mean attendance at A&E is required.
As patient info suggests
“You should call an ambulance or go directly to the nearest emergency department if you bring up (vomit) blood.”
Vomiting Blood Vomiting Blood (Haematemesis) | Causes, Help and Treatment | Patient
From the NHS
Vomiting blood (haematemesis) Vomiting blood (haematemesis) – NHS
As the NHS suggests
“Dehydration means your body loses more fluids than you take in. If it’s not treated, it can get worse and become a serious problem.”
In the adult population the elderly population are most at risk of dehydration.
“Call 999 or go to A&E if:
The following articles suggest how you can reduce the risk of dehydration:
Dehydration Dehydration – NHS, Diarrhoea and vomiting Diarrhoea and vomiting – NHS
As the NHS suggest
“DKA mainly affects people with type 1 diabetes, but can sometimes affect people with type 2 diabetes. If you have diabetes, it’s important to be aware of the risk and know what to do if you get DKA.
You can get DKA if you have high blood sugar (hyperglycaemia) and a high level of ketones in your blood or urine.”
The NHS expands on the symptoms and diagnosis in their article
Diabetic ketoacidosis Diabetic ketoacidosis – NHS – NHS
As the NHS suggest
“Go to your nearest A&E immediately if you think you have DKA, especially if you have a high level of ketones in your blood or urine. DKA is an emergency and needs to be treated in hospital immediately.”
Importantly it is the other symptoms which indicate a serious condition, so look for these other symptoms.
Vomiting does not necessarily need to be part of the following serious conditions but can be:
Call 999 if you have severe bleeding that cannot be stopped.
Bleeding in certain situations or when combined with other symptoms or signs may indicate an emergency response is needed and calling 999. If you are not sure call 111. Some important examples include:
As the NHS suggests if “your nosebleed lasts longer than 10 to 15 minutes or seems excessive” you should attend A&E. The reasons to attend A&E with a nose bleed are expanded on in the following article: Nosebleed Nosebleed – NHS
As the NHS suggests
“Call 999 or go to A&E immediately if:
As patient info suggests
“You should call an ambulance or go directly to the nearest emergency department if you bring up (vomit) blood.” Vomiting Blood Vomiting Blood (Haematemesis) | Causes, Help and Treatment | Patient
From the NHS
Vomiting blood (haematemesis) Vomiting blood (haematemesis) – NHS
As the NHS suggests
“Go to A&E or call 999 if:
From Patient info
Rectal Bleeding Rectal Bleeding (Blood in Stool) | What to do | Causes and Treatment | Patient
Certain fractures should always be treated in A&E which is explained below
As the NHS suggests
“Always call 999 for very severe suspected breaks, such as a broken neck or back.”
“Go to your nearest A&E for a broken arm or leg. Call 999 for an ambulance if the injury to the leg seems severe or you’re not able to get to A&E quickly.”
Injuries which include certain features should also be assessed in A&E which is elaborated on here:
From Patient info and NICE
Head Injuries
As the NHS suggests
“Go to a hospital accident and emergency (A&E) department for:
As the NHS suggests
Call 999 and ask for urgent help for the following
Acid and chemical burns Acid and chemical burns – NHS
Though as explained in the article, minor eye injuries can be treated at home, any serious injury (including high speed injuries with power tools, hammers and lawn mowers) should be assessed in an eye casualty so call 999 for urgent help (remember they can tell you where your closest open eye casualty is)
Eye injuries Eye injuries – NHS
As the NHS suggest
“Call 999 in a mental health emergency including if someone has seriously injured themselves or taken an overdose”
When to call 999 When to call 999 – NHS
As the NHS suggest
“If they’re showing signs of being seriously ill, dial 999 to request an ambulance or take them to your local A&E department.”
Symptoms associated with serious poisoning include:
Some common eye symptoms which need to be assessed in an eye casualty have been listed in the local self-referral subsection, (see “Serious symptoms and signs which require assessment in an eye casualty as an emergency” ) found under
Having some basic knowledge of the symptoms and signs of sepsis can allow you to identify when someone is becoming seriously ill and take immediate action. This is explained under
For information on reducing the risk of accidents for all ages see under
For detailed information on reducing the risk of falls, particularly in older people, see under
As the NHS suggest
“Every year in the UK, thousands of people die or are seriously injured in incidents. Many deaths could be prevented if first aid was given before emergency services arrive.”
“First aid.” The NHS website. Retrieved 4/4/2024
Learn how to give first aid