Here is one place to start for more information - TC Handbook for Civil Aviation Medical Examiners
Do a search for hypothyrodism and you'll see what it says.
Good luck - medical issues and these type of decision are always difficult to deal with.
“It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.”
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That is, don't fly if you have a condition or you're receiving medical treatment that makes you unfit to fly.404.06 (1) Subject to subsection (3), no holder of a permit, licence or rating shall exercise the privileges of the permit, licence or rating if
(a) one of the following circumstances exists and could impair the holder’s ability to exercise those privileges safely:
(i) the holder suffers from an illness, injury or disability,
(ii) the holder is taking a drug, or
(iii) the holder is receiving medical treatment;
And secondly to inform your doctor and optometrist that you hold an aviation document (Aeronautics Act, 6.5(2)).
Every doctor and optometrist in Canada (not just a CAME) is required by 6.5(1) of the Aeronautics Act to report anyone with an aviation document who has a condition likely to constitute a hazard to aviation "inform a medical adviser designated by the Minister forthwith of that opinion and the reasons therefor." If they do that then TC will contact you to tell you if your medical certificate is suspended.
Other than that it's up to your CAME to approve your request for a medical renewal at the appropriate time. The CAME has the responsibility to confer with TC if in doubt.
I don't see anywhere a requirement for you to report anything to TC yourself, and I don't know what TC would do with that information if you provided it to them. You're not a doctor and you wouldn't know what to report.
The medical handbook referred to above says:
So you are now on notice that you have a condition which until stabilized meets the test in 404.06(1)(a)(i). So you have to ground yourself. But I still don't see anything that requires you to tell the government about it. That's your doctor's job.Thyroid Disorders:
Hypothyroidism is acceptable if adequately treated and stabilized.