My son is 10 years old and has always had leg pain ...

My son is 10 years old, he has always had leg pains since he started walking. He's done several tests and never accuses anything. Yesterday a series of exams was done and it gave high erythrocyte sedation, what can it be?
Expert answer:

This examination suggests some kind of inflammation in the body, it is very non-specific and can give altered in thousands of situations from an influenza to a broken bone, so you can not know what he has for this test.