Whether or not a patient with early thyroid cancer will lose weight depends on whether or not the patient’s thyroid cancer tissues will secrete too much thyroxine. 1. Wasting: There are many types of thyroid cancer, if it is high-functioning thyroid cancer, the patient will lose weight in the early stage of cancer. Because high-functioning thyroid cancer secretes too much thyroxine, which causes hyperthyroidism and excessive consumption of nutrients, the patient will lose weight in the early stage of the cancer. 2. No wasting: If the patient’s thyroid cancer type is non-high-functioning thyroid cancer, the thyroxine level in the patient’s body in the early stage of the cancer will not be too high, and there may not be any other symptoms except for the abnormally proliferated thyroid cancer tissues in the local area. It is recommended that the patient should seek medical treatment immediately when wasting occurs. It is recommended to go to the hospital to improve the examination and take targeted treatment after a clear diagnosis, and not to treat the patient indiscriminately, so as not to cause adverse consequences.