When someone undergoes surgery, she is given various medications for pain and swelling. These may cause an allergic reaction in the patient. The severity of allergic reactions can range anywhere from mild coughing and fever to the development of hives or death. Plastic surgery is carried out under general anesthesia, which is known to carry a slight chance of putting the patient to sleep so that he is unable to be revived. So limiting the number of general anesthesia procedures one undergoes is wise. Surgery can also lead to a rare type of infection, called toxic shock syndrome, which carries a fairly high mortality rate.