You should call 999 or go to A&E if you, or someone you know, experiences a life-threatening medical or mental health emergency. These are cases where there is immediate danger to life or physical injury. A mental health emergency should be taken as seriously as a medical emergency. If you feel like you may be close to acting on suicidal thoughts or have seriously harmed yourself, you should call 999 or go to A&E directly if you need immediate help and are worried about your safety.