Hypothyroidism is a common cause of unexplained weight gain and an inability to lose weight. A lesser known condition is secondary hypothyroidism, which has many of the same symptoms as primary hypothyroidism, but does not have the same cause or treatment.
The Thyroid's Job
The thyroid is a small gland located just below the voice box. Its job is to regulate metabolism.
The Thyroid and the Pituitary Gland
The pituitary gland along with they hypothalamus regulate the release of hormones from the thyroid that maintain metabolism.
Primary vs. Secondary Hypothyroidism
Primary hypothyroidism is caused by a failure of the thyroid itself. Secondary hypothyroidism is caused by the failure of the pituitary gland. If the pituitary gland stops working, it no longer regulates the thyroid.
First Symptoms
Early symptoms can include exhaustion, brittle finger nails, feelings of depression, muscle aches and weight gain.
Late Symptoms
As the condition progresses, loss of voice, irregular menstrual cycles in women, thinning eyebrows, slowed speech and dry flaky skin can occur.
Treatment
Treatment for secondary hypothyroidism will be a course of hormones to replace those not being made by the thyroid and pituitary gland. In addition, a low-calorie, high-fiber diet is recommended.
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