Biological couses of violence

First, the biological causes. These are the easiest to talk about, because there is not much to say.
Many biological factors have been nominated as candidates for causes of violence. Hormones like testosterone, transmitters in the brain like serotonin, and blood abnormalities like hypoglycemia are only a few that have been mentioned.
Biological factors do not have to be hereditary. They could be caused by a head injury, poor nutrition, or environmental events, such as exposure to lead paint.
Fortunately, the National Academy of Sciences just reviewed hundreds of studies on the relationship between biology and violence, and it came to one clear bottom-line conclusion: "No patterns precise enough to be considered reliable biological markers for violent behavior have yet been identified."  The National Academy of Sciences found many promising leads that should be vigorously pursued by researchers, but so far, it could point to nothing as a proven, or even close to proven, biological risk factor for future violence.

This means that There are only a few reasons why people tend to be violent on the world coused by the biological factors. This factor has the least couses for example it does not have to be coused by hereditary problems coused by the mother or the father. Some of thif factors can ocur after an acident or some sort of problem. some of them can be coused by problems during pregnency and many other problems likle this one. there is no patern determined percisely how this works out. unfortunetly this problems cannot chage and this might be soimthing all humans have problems with this only that some are more likely to expose themselves than others.


http://www.sodahead.com/united-states/the-causes-of-violence/blog-263921/