Weight loss may be due to hyperthyroidism, which is caused by an increase in the concentration of thyroid hormones in the blood. Thyroid hormones promote the process of material and energy metabolism, increase the body’s oxygen consumption and promote the process of heat production. Therefore, typical hyperthyroidism is characterized by high metabolic symptoms such as excessive sweating, panic attacks, overeating, easy hunger, weight loss, and agitation. Not all symptoms appear in the same patient, so a patient who does not lose weight may be hyperthyroid. In addition, wasting diseases such as diabetes, tuberculosis, and tumors can also cause weight loss, and a detailed examination at the hospital is needed to clarify.