Why Do People Become Allergic, And Why Are Allergies On The Increase?

Allergies are on the increase - a third of the population believe that they suffer from allergies, and even though some of these people may be mistaken, everyone agrees that eczema, asthma, hay fever, irritable bowel syndrome, etc. are now more and more common. So, what has happened? It is often unclear why a person has a tendency to be allergic or intolerant to a range of substances. Medical practitioners talk about