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Thyroid hormone actually represents the combination of the two main hormones that your thyroid gland releases: thyroxine (T4) and triiodothyronine (T3). They’re often collectively referred to as “thyroid hormone” because T4 is largely inactive, meaning it doesn’t impact your cells, whereas T3 is active.
Your thyroid is an important endocrine gland that makes and releases hormones. Your thyroid's main job is to control your metabolism — how your body uses energy.
Your thyroid is a small, butterfly-shaped gland located at the front of your neck under your skin. It’s a part of your endocrine system and controls many of your body’s important functions by producing and releasing thyroid hormones, like thyroxine (T4) and triiodothyronine (T3).
Hypothyroidism is when your thyroid gland doesn’t make and release enough hormone into your bloodstream. The condition slows down your metabolism, making you gain weight unexpectedly or feel tired all the time.
Parathyroid glands: These are four pea-sized glands that are typically behind your thyroid. Sometimes they exist along your esophagus or in your chest (ectopic parathyroid glands). They release parathyroid hormone (PTH), which controls the level of calcium in your blood.
Your parathyroid glands have one job: making and releasing parathyroid hormone (PTH). Together, PTH and another hormone — calcitonin — tightly control the levels of calcium in your bloodstream. Having too much or too little calcium in your blood can be associated with health issues.
Thyroid gland. Your thyroid is a small, butterfly-shaped gland located at the front of your neck under your skin. Your thyroid’s main job is to control the speed of your metabolism (metabolic rate), which is the process of how your body transforms the food you consume into energy. Your thyroid releases the following hormones: Thyroxine (T4).
Goiter is an adaptive reaction of the cells in your thyroid to any process that blocks thyroid hormone production. While the most common cause of goiter worldwide is iodine deficiency, many conditions can cause it.
In most cases, irregular thyroid-stimulating hormone (TSH) levels mean there’s an issue with your thyroid — it’s either producing too much thyroid hormone or too little. The good news is that your thyroid hormone levels, and TSH levels, can be corrected with treatment and medication.
Hyperthyroidism, also called overactive thyroid, is a condition where your thyroid makes and releases high levels of thyroid hormone. It has multiple possible causes. The main thyroid hormones are triiodothyronine (T3), thyroxine (T4) and thyroid stimulating hormone (TSH).