Insufficient thyroid secretion mainly causes symptoms of hypothyroidism, which is characterized by low metabolism and low calorie status of the thyroid gland. Patients initially show sluggish nerve response, forgetfulness is a more typical clinical symptom, this disease starts rather insidiously, often appearing weakness, sleepiness, no interest in life. At the same time, with the passage of time, the aggravation of the disease will appear special skin manifestations, mucous edema, while the skin due to the lack of heat will also be afraid of cold, metabolic impact on the digestive system, loss of appetite, gastrointestinal dynamics, constipation or diarrhea. It may also affect the cardiovascular system, including a decrease in heart rhythm, chest tightness, shortness of breath, fatigue and weakness of the limbs. The effects on the nervous system are mostly apathy and unresponsiveness. Therefore, in the case of insufficient thyroid secretion, it is best to go to a regular hospital for a detailed examination, and by supplementing levothyroxine sodium tablets, the symptoms can be improved.