Ans : Severe allergic response to a substance. Symptoms include wheezing, itching, nasal congestion, hives, immediate intense burning of hands and feet, collapse with severe drop in blood pressure, loss of consciousness and cardiac arrest. Symptoms of anaphylaxis appear within a few seconds or minutes after exposure to substance causing reaction this can be medication or herbs taken by injection, by mouth, vaginally, rectally, through a breathing apparatus or applied to skin. Anaphylaxis is an uncommon occurrence, but when it occurs, it is a SEVERE MEDICAL EMERGENCY! Without appropriate immediate treatment, it can cause death. Yell for help. Don't leave victim. Begin CPR (cardiopulmonary resuscitation), mouth-to- mouth breathing and external cardiac massage. Have someone dial "0" or 911. Don't stop CPR until help arrives.