These external reasons are basically factors which are outside the body like polluted air, certain kinds of fabrics and other related materials. The body also reacts to certain kinds of internal factors and these include the food that we eat and other related components, which affect the internal organs of the body.Diagnosis There are various kinds of treatments available for these allergies also although getting a permanent solution for the same is usually difficult. The basic causes of these allergies should be understood to stop these reactions and hence you should try and implement methods for the same.A vital factor to understand here is that the immune system of the body is set up to protect our bodies from harmful and foreign substances. These substances include viruses and bacteria that can enter the body in buy cplex60 the form of dirt and germs and during this time if the immune system is not developed properly or oversensitive to a substance then you get an allergic reaction to the same. It has been seen that in such instances the immune system reacts to things that aren’t harmful and don’t usually cause people any problems then these things are called allergens.These allergens can be defined as the substances or things that cause allergies or result in allergies. When the oversensitive or improperly developed immune system catches or witnesses these allergens then it releases chemicals like histamine, which cause the symptoms that are common with allergies. Usually the most common symptoms of allergies are itching, watery eyes, runny nose, swelling, hives or rashes and different people have different symptoms for the same causes.