Experts everywhere are arguing over the effects of steroid use on individuals, sports, and society. Anabolic steroids build up muscle tissue. Most steroids used for medical purposes are synthesized in labs. These are used by doctors to treat a wide variety of diseases, such as muscle wasting, growth deficiency, asthma, skin conditions, and others. Two groups of people commonly abuse steroids: athletes who believe that building up more muscle will give them a competitive edge, and people who are concerned about their personal attractiveness, who wish to enhance their physique. Buying and using steroids without a prescription is illegal–and dangerous. Steroids have many serious effects on the body and mind. Too much of them can cause harm and permanent damage.