Why do doctors deny adrenal/thyroid connection?

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http://www.pharmacyhealth.net/d/l-thyroxine-1362.htm

L-THYROXINE PRECAUTIONS:

Before using L-THYROXINE, tell your doctor your medical history, especially of:

heart problems, diabetes, adrenal gland problems, any allergies (including drug

allergies). Avoid using thyroid drugs for weight control. Current information

shows that L-THYROXINE may be used during pregnancy. Small amounts of

L-THYROXINE are excreted into breast milk. Consult your doctor before

breast-feeding.