Scientists have attempted to test the association between anabolic steroids and aggression by administering high steroid doses or placebo for days or weeks to human volunteers and then asking the people to report on their behavioral symptoms. To date, four such studies have been conducted. In three, high steroid doses did produce greater feelings of irritability and aggression than did placebo, although the effects appear to be highly variable across individuals. In one study, the drugs did not have that effect. One possible explanation, according to the researchers, is that some but not all anabolic steroids increase irritability and aggression. Recent animal studies show an increase in aggression after steroid administration.
Another answer to the question “what do steroids do?” has to do with their numerous uses in treating a variety of medical conditions. Medical steroids can help people gain weight after serious illnesses or traumatic injuries, they can treat certain types of anemia, and in some cases, they can even help fight breast cancer. Most commonly, though, physicians prescribe different types and preparations of testosterone to men who have a condition known as Low-T (low testosterone). Once a man reaches the age of about 30, his body no longer produces the same amount of testosterone, which can result in a variety of undesirable symptoms. Prescription testosterone can treat these, and it often drastically improves the quality of life for many of these men.