What should you do with a person who has fainted?

If someone has fainted, first ensure they are in a safe position, preferably lying flat on their back with their legs elevated to improve blood flow to the brain. Check their responsiveness and breathing; if they are unresponsive or not breathing, call emergency services and begin CPR. If they regain consciousness, reassure them and encourage them to stay lying down until they feel stable. Monitor their condition and seek medical attention if they do not recover quickly or if there are any concerning symptoms.