it is the body's reaction to stress to have your belly hurt or feel like the wind was knocked from you i know when i was younger i lost a close relative to an illness and was there when he passed i felt like a part of me actually died when he did it is a reaction to the stress that the mind gives the body thank god we have these feelings imagine if nothing happened to us when something bad happened what a world it would be then humans are one of the only animals that have such feelings of loss or sickness when something bad is happening all other animals ether fight or run under stress