Research led by Dr Suzanne Richards at the University of Exeter Medical School indicates that altruistic behaviors -- those born of an unselfish concern for the welfare of others -- can have a profound effect on a person's emotional well-being. The study shows that helping others improves social interaction, distracts people from their own problems, and improves self-esteem and competence. It even suggests concern for others can allow one to build a "kindness bank" of memories that can be drawn upon well into the future.

While many studies on the positive aspects of altruism deal with emotional well-being, research has also shown that helping others has physical benefits as well. It leads to increased social integration which allows people to lead more active lifestyles. It reduces stress and its associated negative impacts on the body, and it can boost a person's immune system which helps ward off disease. Studies of older people have shown that those who help others live longer, and presumably happier, lives than those who don’t.

Helping others affects brain chemistry. Scientists have documented the physiological changes that occur in the brain when someone sees the response to their altruistic behavior. A group of economists at the University of Zurich said they have found the sweet spot in the brain associated with altruistic behavior. It appears that variations in the size and activity of a brain region known as the right temporoparietal junction dictates your ability to appreciate the perspectives of others, and it creates the possibility that stimulating it could allow almost anyone to enjoy the many benefits associated with altruistic behavior.

The benefits associated with helping others can have limits. When it's taken too far, it can actually cause harm. Pathological altruism can play a role in a broad variety of disorders. Researchers who make this argument take a zero sum approach to the issue. They argue that there is no such thing as a free lunch; there are always trade-offs. People who may lead seemingly normal, altruistic, public lives can pay the price in their private ones. Pathological altruism has been ascribed to those who put up with an abusive or alcoholic partner. In cases such as these, being overly well-intentioned can delude a person regarding what is truly helpful to others and to themselves.