Hello,
Given your sister-in-law's symptoms, it is quite possible that she is suffering from Hashimoto's hypothyroidism. This is a condition where there is decreased production of thyroid hormones. Symptoms include hoarseness of voice, irritability, mood swings, tiredness, lethargy, forgetfulness, difficulty in concentrating, inability to process information, mood swings, weight gain, loss of hair etc.
She will need to have her blood tested for thyroid antibodies and the levels of TSH, T3 and T4.
You will need to discuss her blood levels with her doctor. If the thyroid hormone tests have not been done, they will need to be done as early as possible.
You can read more about hashimoto's here:
- http://cpmcnet.columbia.edu/dept/thyroid/HypothyroidismHP.html
- http://www.medicinenet.com/hypothyroidism/article.htm
I hope this helps.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology