The thyroid gland secretes two hormones that regulate your body’s metabolism, triiodothyronine (T3) and thyroxine (T4). If your TSH levels are too high or too low, you may experience a wide range of symptoms. A thyroid blood test is usually advised when you’re experiencing some of these symptoms:
- An underactive thyroid gland (hypothyroidism) is often suspected when you’re experiencing unexplained weight gain, fatigue, hair loss, dry skin, constipation, frequent menstrual periods, or if you feel too cold all the time.
- An overactive thyroid (hyperthyroidism) is suspected when you have unexpected weight loss, nervousness, diarrhea, irregular menstrual periods, your heart is beating too fast, or you frequently feel overheated (feeling too hot may also be due to menopause).
If you see any of these symptoms, a simple blood test can determine whether your thyroid is at fault. Thyroid disorders are often hereditary, so knowing your family history is important.