Signs Your Thyroid May Not Be Functioning Properly Your thyroid is a small, butterfly-shaped gland located at the front of your neck , but don’t let its size fool you; its impact on your health is huge. This gland produces hormones that regulate metabolism, energy levels, heart rate, and even mood. When the thyroid isn’t functioning properly, it can affect nearly every system in your body. Recognizing the signs early can help prevent more serious health problems down the line. Unexplained Weight Changes If you notice sudden weight gain or weight loss without changing your diet or activity level, your thyroid might be at fault. An underactive thyroid (hypothyroidism) slows metabolism, leading to weight gain, while an overactive thyroid (hyperthyroidism) speeds it up, causing weight loss. Fatigue and Low Energy Constant fatigue, even after a full night’s sleep, is a classic sign of thyroid imbalance. Hypothyroidism can make you feel sluggish , while hyperthyroidism may cause restlessn...