A 9-year-old boy who has not grown for a year may be caused by malnutrition, insufficient secretion of growth hormone or thyroid hormone. Normal people need a supply of nutrients such as carbon hydrates, proteins, fats and vitamins during growth and development. If there is an insufficient supply of nutrients during growth and development, it may lead to symptoms of stagnant growth in the child. Insufficient secretion of growth hormone or insufficient secretion of thyroid hormone may be due to pituitary tumors, hypothyroidism, etc., while growth hormone and thyroid hormone can regulate the endocrine mechanism, which can promote growth, etc., and if insufficient secretion occurs, it may lead to the symptom of growth stagnation. The 9-year-old boy did not grow for a year, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.