Pain is the way our body tells us that something is wrong. It can be caused by injury, illness, or other types of damage. When we experience pain, our nervous system sends signals to our brain that something is happening, and our brain interprets these signals as pain. The reason we feel pain is because our body has evolved to protect itself. Pain tells us that we need to take action to avoid further harm. For example, if we touch a hot stove, the pain tells us to move our hand away to avoid getting burned. As for when our body knows to stop feeling pain, there are different mechanisms at play. Some pain, like the pain from a cut or a burn, will eventually stop once the body has healed. Other types of pain, like chronic pain from an injury or illness, can persist for a long time.