Does thyroid problems can cause weight gain or loss and fatigue?

Yes, thyroid problems can cause both weight gain and weight loss, as well as fatigue. The thyroid is a small, butterfly-shaped gland located in the front of the neck. It produces hormones that regulate metabolism, which controls how the body converts food into energy. When the thyroid does not produce enough hormones (hypothyroidism), metabolism slows down, which can lead to weight gain and fatigue. Conversely, when the thyroid produces too much hormones (hyperthyroidism), metabolism speeds up, which can lead to weight loss and fatigue.