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About the thyroid gland
The thyroid gland is an endocrine gland. This means that it secretes hormones into your bloodstream. Hormones are chemicals produced by the body to help regulate how your cells and organs work. They are sometimes called chemical messengers.
The thyroid gland is located in the neck in front of your windpipe. It is about 2cm wide and 4cm high.
What are the thyroid hormones?
The thyroid gland secretes two hormones: thyroxine (also called T4) and triiodothyronine (also called T3). Together, these hormones regulate your body's metabolism. They control how quickly your body burns energy.
Your rate of metabolism affects lots of things, such as how much you weigh, and how much you sleep. Thyroxine and triiodothyronine speed up the body's metabolism, causing processes in your body to happen faster.
The production of the thyroid hormones is controlled by another hormone called thyroid stimulating hormone (TSH). This is made by an endocrine gland in the brain called the pituitary gland.
Symptoms
Hypothyroidism usually develops gradually. The symptoms are mild, and you may not even notice them at first. This is called subclinical hypothyroidism.
If hypothyroidism develops, it causes a general slowing down of your body's functions. Some of the symptoms include:
- feeling tired and sleeping a lot
- feeling the cold easily
- dry and/or pale skin
- coarse, thinning hair and brittle nails
- sore muscles, slow movements and weakness
- a hoarse or croaky voice
- a change in facial expression
- depression
- problems with memory and concentration
- weight gain
- constipation
- fertility problems and increased risk of miscarriage
- heavy, irregular or prolonged menstrual periods
- a slow heart rate
You may also have swelling of the thyroid gland in your neck. This is called a goitre.
Occasionally, hypothyroidism gets better without treatment. In general, however, the symptoms get progressively worse if it isn't treated, and it becomes more and more difficult to function normally.
Overactive and Underactive Thyroid
The opposite condition to hypothyroidism is hyperthyroidism. This happens when the thyroid is overactive and produces too much thyroid hormones. This speeds up your body's metabolism, leading to symptoms such as weight loss and anxiety.