A medical emergency is a situation in which the health of a person is at high risk of deteriorating rapidly without immediate medical attention.
For example, chest pains, increasing difficulty in breathing, impaired consciousness and any of the signs of a stroke (facial weakness, inability to lift a limb or slurred speech) constitute an emergency.
In a medical emergency you can access urgent paramedical help by calling 999 (or 911)
Medical help between 18:30 and 08:30 Mondays - Thursdays and 18:30 on Friday to 08:30 on Monday is provided by NHS111.
If you need medical assistance between these hours please dial 111.
Your problem will be assessed by NHS111 and you may be given advice by them or asked to attend a local accident and emergency department. If necessary your case will be forwarded to an out of hours service who provide appointments for assessment by a doctor and a home visiting service should there be a medical need. They may ask you to attend one of the Primary Care Out-of-Hours Centres in central London. Alternatively your call may be passed on to the Ambulance Service, a paramedic or a district nurse as appropriate.