👉 Prethyroid is a condition in which the thyroid gland (an organ located at the back of the neck) does not produce enough hormones to regulate body functions. This can lead to a range of symptoms, including fatigue, weight loss, and difficulty sleeping. Prethyroidism can be caused by an underlying medical condition, such as hypothyroidism or hyperthyroidism, or it may also indicate other health problems. If left untreated, prethyroidism can progress into thyroid cancer if