Hyperthyroidism is an overactive thyroid. The condition develops when the thyroid gland produces too much T3 and T4 hormone, driving up metabolism and causing a variety of symptoms and health problems.
High levels of thyroxine hormone can cause sudden weight loss without an apparent cause. This increase in T3 and T4 hormones in the blood raises the metabolic rate, causing the affected person to more quickly burn food for energy. Though this might seem appealing initially, high-speed absorption and elimination mean the body cannot receive all the nutrients the food has to offer, leading to deficiencies and various symptoms. The body might, for example, start cutting into fat reserves, which causes fatigue. Sudden, unexplained weight loss always calls for a visit to the doctor.
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