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Thryroid image source – © GRei – shutterstock.com
The thyroid gland is a part of the endocrine system which produces and regulates hormones in the body. This small, butterfly-shaped organ can be found in the front part of the neck, only palpable when a person swallows (as the thyroid moves up and down). The thyroid produces several hormones, namely: thyroid stimulating hormones (TSH), thyroxine (T4) and triiodothyronine (T3). The hormones produced by the thyroid regulate growth, metabolism, and body temperature – which is why thyroid problems (either an underproduction or overproduction of hormones) usually affect weight, activity, and physical development. 
Hypothyroidism (UNDERactive thyroid, does not make enough thyroid hormone) and hyperthyroidism (OVERactive thyroid, makes too much thyroid hormone) are two very different conditions, although some signs and symptoms like fatigue are found in both.  Managing thyroid problems involves observing these signs and symptoms so recognizing what exact condition you may have is very important. Note – this article is not intended for self-diagnosis or self-treatment. If you have symptoms or think you may have thyroid problems, consult your doctor for actual diagnosis and treatment.