Am 45 y old, was on low dose thyroid up until 2011 when I had twins. Thyroid levels evened out during pregnancy so was taken off thyroxine. Endo, at time said get levels tested every 6 months with gp, as the levels will change and I will need meds sooner or later.
Gp not worried about results as always just on cusp of needing meds, but I have so many of the physical symptoms, which I have brought to gps attention. I am exhausted and cannot get myself together. Gp will not put me back on low dose of thyroxine even to see if it helps for a trial period, because bloods not quite there. What can I do??
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Sassy72
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TSH is low-normal but FT4 8 is bottom of the range which could indicate secondary/central hypothyroidism due to a deficiency of TSH. The thyroid gland is usually healthy but can't produce sufficient thyroid hormone because TSH is insufficient. Treatment is Levothyroxine to raise FT4 into the upper range but management should be via endocrinology who will investigate whether pituitary dysfunction is causing deficiency of sex and growth hormones too.
NICE states:
Secondary or central hypothyroidism is the result of insufficient production of bioactive TSH due to a pituitary or hypothalamic disorder.
Urgent referral to an endocrinologist should be arranged if:
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Thyroxine dose evidence and spray vitamins 
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My GP wont increase thyroxine:-(
Advice needed on thyroxine management
