The causes of leg pain can be musculoskeletal, neurological, or vascular. Shin splints and stress fractures can result from repetitive sports, such as running. Leg pain can sometimes indicate a serious vascular problems.
Noun. 1. altruism-the quality of unselfish concern for the welfare of others. selflessness. unselfishness-the quality of not putting yourself first but being willing to give your time or money or effort etc. for others; rural people show more devotion and unselfishness than do their urban cousins.
For the purpose of our study, we prefer a definition that relies on objective, measurable criteria. We characterize a behavior as altruistic when: it is directed towards helping another; it involves a high risk or sacrifice to the actor; it is accomplished by no external reward; it is voluntary.