Psychiatric emergencies are conditions in which there is alteration in behavior, emotion or thought, presenting in an acute form, needing immediate attention and care. This has become a challenging field in the face of rise in incidence of violence, rape, abuse, addiction and murder in the society. Effective and prompt emergency care in emergency room (ER) not only helps stabilize the emergency conditions but also lessens the burden on routine services. This chapter covers the history, general approach, common psychiatric emergencies, and ethical issues. Psychiatric emergencies are seen mostly in ER of a hospital, but these can be encountered in any routine psychiatric set up. Psychiatry emergencies do not mean that patients are suffering from only psychiatric disorders. They may present due to medical conditions, or conditions unrelated to medical field, like disaster, rape, violence.