Signs Your Thyroid Might Not Be Functioning Properly When your thyroid isn’t functioning properly, it can quietly impact nearly every system in your body. This small, butterfly-shaped gland in the neck plays a major role in regulating metabolism, hormone balance, and energy production. When it becomes overactive ( hyperthyroidism ) or underactive ( hypothyroidism ), your body sends distress signals that shouldn’t be ignored. Unexplained Weight Changes One of the earliest indicators of thyroid imbalance is a sudden shift in weight. An underactive thyroid slows metabolism, leading to weight gain even with normal eating habits. Conversely, an overactive thyroid speeds up metabolism, causing rapid or unintentional weight loss. Fatigue and Energy Drops If you constantly feel tired despite adequate rest, your thyroid may be underactive. Hypothyroidism causes slower energy production, leaving you feeling sluggish and mentally foggy throughout the day. Mood and Cognitive Changes Thyroid...