Ok, one very common route is they are both controlled by the Pituitary
gland.  If this gland is malfunctioning in terms of thyroid
performance it may well do so for adrenal control. I understand that
Glandular fever (mono) can cause this problem.

Another route is that the body may have been compensating for under
active thyroid by running on adrenals until they are exhausted as
well, a bit woolly but people seem to feel that.

A third route is copper/zinc balance. According to a book I have just
got (ISBN 0-06-251569-1 by Ann Gittleman, a nutritionist) if the ratio
of zinc to copper in the body is wrong, either due to low zinc, high
copper, or both then several things happen.

Copper zinc imbalance can apparently impede T4/T3 conversion which
often does not show up on thyroid tests.

Zinc is also needed for the production of adrenal cortical hormone.

If you have this copper/zinc problem then both thyroid and adrenal
function can be inhibited. According the author dietary (or more
accurately eating pattern) changes can help this ratio. This can then
avoid the need for thyroid/adrenal support in some cases.

Interestingly enough a high protein/low carb diet is recommended which
ties in with what a lot of people have said in this group..

One of the effects listed for the natural progesterone treatment that
two people are using at the moment is to equalise copper/zinc
imbalances, it all ties together.

With that I'll leave someone else to fill in the bits I've missed.

Nick
--

Warning, I am not a Doctor, If you are thinking of making any changes to your medication discuss it with your doctor first.

Check these sites for good information on thyroid problems
http://www.personal.u-net.com/~my4tune/appto_treatment.txt
http://www.personal.u-net.com/~my4tune/itg.htm
http://thyroid.miningco.com/