I've read about other women on MM and hystersisters whose HRT stopped working, or isn't working as well as they'd like. A high percentage of us, it seems, have Hashimoto's too.
I've seen the famous consultants. Each has a different explanation, or no explanation, and some flatly deny it happens.
The most plausible explanation I had was from a Prof in Italy who has studied estrogen receptors all his long working life, he said:
"as you seem to know, a hormone induces its effect via interaction with its receptor; therefore, the lack of the effect may be the result either of the lack of the hormone or of the dysfunction/resistance of its receptor.
As estrogen replacement therapy keeps the level of estrogen within normal/high values, the lack of effect must depend on dysfunction/resistance of peripheral receptors.
There is an extremely rare genetic condition, the "Estrogen Insensitivity Syndrome", in which the estrogen receptor is defective.
But in your case, the insensitivity is acquired, a condition analogous to resistance to insulin in type 2 diabetes, in which the lack of effect is due to acquired resistance of peripheral insulin receptor.
In conclusion, I would suggest that in your case the insensitivity to exogenous estrogen finds its origin in an increased resistance to the hormone.
You may ask why this happens. In the case of increased insulin resistance, various causes have been suggested, among which I would primarily consider chronic or long lasting low level inflammation as in the case of the so called "Metabolic Syndrome" (which includes insuline resistance) or in auto-immune diseases (including Hashimoto's disease), and older age in general, etc."
What I simply can't understand is that top consultants don't acknowledge it/agree.
And there's no literature anywhere on this phenomenon.
There's a wikipedia entry on Estrogen Insensitivity Syndrome, which is so rare it affected fewer that 10 people. But NOTHING on why women stop responding to HRT - and many more of us are affected. How come?
Anyone got any thoughts?