What is the sociological difference between the words 'common' and normal'?

Common happening often and to many people or in many places http://www.ldoceonline.com/dictionary/common_1 Normal Functioning or occurring in a natural... show more Common

happening often and to many people or in many places

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Normal

Functioning or occurring in a natural way

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It is becoming quite common to have a poor diet. It is becoming very common for people to not exercise enough, and even more common for people to be over stressed.

The other common theme running through our society is chronic illness. Strokes, heart attacks, diabetes, cancers and even back pain are all becoming increasingly common ailments. It is becoming so common that people are starting to think it is ‘normal'.

However, things can only be called common, but 'not' normal.

When the body is in a state of optimal health, all systems are in equilibrium and no external manifestations of disequilibrium (symptoms) are apparent. Many of the subtle changes we observe, even in our pets, are early warning signs that there is imbalance existing deep within the body. These are not "diseases" per se but rather are commonly observed deviations from this state of equilibrium.
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