If you're interested in learning more about potentially life-threatening conditions, how to spot the signs of these and what you can do to help someone experiencing them, you can do so using the links below.
Remember, you should always call 999 is someone is seriously ill or injured, or their life is at risk.
Please see our when you should call 999 page for examples of medical conditions that are considered emergencies, as well as information on alternative care options if it is not a life threatening emergency.
For information on the two types of most serious heart conditions, heart attacks and cardiac arrests, as well as a video showing how to use a defibrillator, visit our Chest pain page.
If you want to learn more about what a stroke is and how to recognise the signs of a stroke using the FAST test, visit our Stroke page.