In general, cosmetic surgery is performed on people who can withstand the surgery. This means that you should not have any medical problems that would prevent them from withstanding the surgical procedure or the anesthesia associated with it. Since many of these implants are performed under local anesthetic, most people would be able to tolerate the procedure. General categories of people who are not good candidates for surgery are people with significant heart problems, bleeding disorders, immune deficiencies and a variety of other problems that are too many to mention here.