Several: The most common cause is Hashimoto's thyroiditis which is an auto-immune disorder.Other causes,which would not apply to you based on your question, include:radioactive iodine treatment,radiation therapy to neck,medications(amiodorone,interferon,lithium).Keep follow up with your doctor to get your treatment.Best wishes.
Answered 9/15/2014
3.7k views
Mostly, autoimmune: I was surprised to find that in about 90% of non-elderly with hypothyroidism, the immune system is attacking the thyroid and stomping it. There are simple blood tests to find proteins put out by the immune system that bind and mess up the thyroid.anti-TPO http://emedicine.medscape.com/article/120937-overview
Answered 9/17/2014
3.7k views
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