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What are the symptoms of an underactive thyroid?

What are the symptoms of an underactive thyroid, and how can a person diagnose it for themselves? I have heard it runs in my family and I want to be careful, but I have no idea what to watch for besides being tired and lazy ? which I kind of am already.
Underactive thyroid is known as hypothyroidism. It is a fairly common condition. Fortunately it is easily treated. I recommend discussing your concerns with your doctor. He or she can easily test your thyroid function with a simple blood test that is far more sensitive than symptoms (that is, one can catch the disease earlier). In general, the thyroid gland (located in the neck) is a gland that produces the thyroid hormone. The thyroid hormone is the "energy hormone" -- it facilitates the energy use by all cells in your body. Therefore symptoms of hypothyroidism are decreased cell function. These symptoms include: Fatigue. Feeling cold more often. Constipation (decreased activity of the colon cells pushing the food down). Depression is common. Decreased sweating. Dry skin. Hair loss. Interestingly, loss of the outside part of the eyebrows are common. Change in periods may occur in women. The thyroid gland often enlarges in many low thyroid conditions--resulting in a neck bulge (known as a goiter). Severe hypothyroidism can result in heart failure and even coma. Myxedema coma is a specific type of coma that occurs with hypothyroidism that also results in a puffy nature to the skin. Beyond symptoms, there are physical exam signs your doctor can find. These include low heart rate, "hung up reflexes", decreased bowel sounds and many others. There are also changes seen in your blood work--for example, your cholesterol can increase. Discuss your concerns with your doctor.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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