This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
High thyroid hormones will not cause weight gain.
In fact, you likely have hypothyroidism or low thyroid hormone state.
That can cause weight gain, night sweats etc.
Serum TSH, free T4 levels should be checked.
Adrenal gland disorder is another common cause of weight gain.
Serum cortisol level should be checked.
24 hour urine cortisol level is also checked to rule out cushing's disease.
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