The symptoms of thyroid gland are very characteristic, but it may vary depending on the classification and cause of the thyroid gland. It usually causes hypermetabolic syndrome, such as feeling tired, weak, fear of heat, excessive sweating, moist skin, excessive food and hunger, significant weight loss, and may also be talkative, nervous and anxious, agitated and irritable, insomnia and restlessness, poor concentration, memory loss, and tremors of the hands and eyelids. You may also feel palpitations, shortness of breath, tachycardia, hyperactive mood, increased pulse pressure, etc., as well as loose stools, increased frequency of bowel movements and loose stools, and hyperthyroid periodic paralysis. Women may have decreased menstruation or amenorrhea, and men may have impotence and an enlarged thyroid gland.