Low cortisol in children may affect height. Cortisol belongs to glucocorticoid hormone, and its main function is to maintain blood sugar balance to avoid hypoglycemia; to maintain blood pressure balance; and to promote the synthesis of substances and so on. Low cortisol in children may cause a drop in blood pressure, a decrease in nutrient absorption, anorexia, vomiting and other symptoms. If children’s cortisol level is lower than normal for a long period of time, it is difficult for the body to get an effective supply of nutrients, which results in a lower height than that of children of the same age and gender, and backward growth and development. If children are found to have low cortisol or similar symptoms, it is recommended that they go to the hospital for timely examination and treatment.