syndrome is a "collection" of the same symptoms that occur in
a large number of patients.
They may not have all the EXACT symptoms but fall under the large "umbrella"
of symptoms enough
to include them in a "group". A disease, on the other hand,
is rigidly defined with known disease
mechanisms and identifiable diagnostic protocols. An example is Parkinson's
DISEASE; it is well
recognized and can be tested for, while Chronic Fatigue SYNDROME is again
a collection of symptoms
that "group" a set of patients together, but which there is
no Test that can identify them as suffering from
the disease. They must be diagnosed by symptom alone.