The thyroid gland is an important endocrine gland in the human body. The hormones secreted by the thyroid gland are mainly thyroid hormones, which affect the body’s metabolism, influence the thermogenesis process, and can promote the development of the nervous system. If the thyroid gland is diseased, the level of thyroid hormones may be affected. Whether or not people with thyroid disease will lose weight needs to be analyzed on a case-by-case basis. There are several possibilities: First, if the thyroid disease is hyperthyroidism, which is caused by too much thyroid hormone, the patient will have symptoms of high metabolism such as fear of heat, excessive sweating and weight loss, so the hyperthyroid patient will have the symptoms of weight loss. If the thyroid gland disease is hypothyroidism, because the metabolic rate is reduced, the patient will have fear of cold, swelling of the face and eyelids, as well as weight gain, unresponsiveness, pericardial effusion, etc. Therefore, hypothyroidism will not cause the body to lose weight. Third, if the thyroid disease is a thyroid nodule with normal thyroid function, the symptoms of wasting will generally not occur. Unless in individual cases, patients with malignant tumors consume more and may show the symptoms of wasting.