An alive day is the date of an anniversary of a very close escape from death. People may choose to celebrate their alive days with parties, or with personal reflection, depending on personal taste and their relationship to the events which occurred on the day they narrowly missed dying. Friends and family may also mark an alive day with cards or gifts acknowledging their relationship with the near-deceased.

Members of the military have been celebrating alive days since the Vietnam War, and quite probably even earlier. Fighting in a war tends to increase the probability of dying, and it can seem miraculous to escape death after an engagement with the enemy. Military members are also tightly connected with each other, thanks to their unique experiences in war, and alive day parties can be one way to renew that connection and celebrate a safe return from the battlefield.

The concept of the alive day was popularized by a 2007 documentary, Alive Day Memories, which featured interviews with veterans of the Iraq War who talked about their experiences in battle and their alive days. The Iraq War created a number of opportunities for Alive Day celebrations, thanks to advances in battlefield medicine which increased the probability that soldiers could survive devastating attacks.

The soldiers profiled in the documentary were severely injured, and the film chronicled the ways in which they dealt with their injuries. Many Iraq War veterans have experienced amputations and severe brain injuries, and commemorating their alive days helps them to process the events which changed their lives. Increased awareness about the concept of an alive day has spread out from the military into the civilian community, and this has been encouraged by some psychologists and other professionals who feel that commemorating an alive day can be an important experience.

One doesn't have to be a war veteran to celebrate an alive day. Alive days can commemorate major car accidents, falls which led to severe injuries, and other life-threatening events in someone's life. Since a close brush with death is often an intense and life-changing experience, recognizing the event with an alive day celebration can be an important part of growing and changing. Some people also like to talk about the events which led to their life-threatening accident, with some choosing to speak to communities about their experiences in the hopes of preventing others from making choices which might put them into the same situation.