Allergies are very common. Also both a person’s genes and the environment play a role causing them. If both your parents have allergies, there is a good chance that you will have them too. The immune system normally protects the body from harmful substances such as bacteria and viruses. This system also reacts to foreign substances, called allergens. These are generally harmless and do not cause problems in most people. In US only, almost 50 million people suffer from these conditions. Although the symptoms vary according to each individual, there are treatments and measures that can be taken to reduce number of reactions.