Precocious puberty is a disorder in which abnormal development of secondary sexual characteristics occurs before the age of 8 for girls and 9 for boys. Precocious puberty may bring some psychological problems. Therefore, parents should detect the problem in time and it is necessary to seek early medical consultation. The dangers of precocious puberty should not be underestimated. The causes and symptoms of children with precocious puberty 1. Secondary ones are often caused by tumors, occupations and infections in the central nervous system, etc. When the causes are not clearly identified, the treatment of precocious puberty rashly ignores the original cause and the delayed diagnosis will bring adverse consequences. Some peripheral precocious puberty may be due to problems with the gonads themselves or simply due to excessive exposure to estrogen-containing drugs, food, cosmetics, etc. Generally, stopping the intake of such items can make the condition better. 2. Idiopathic precocious puberty (most of the patients) is caused by early initiation of puberty and increased secretion of sex hormones, resulting in accelerated growth, accelerated bone age and early epiphyseal closure, which may make the child a little taller than his classmates of the same age at the time, but ultimately shorter and may not reach the normal adult height or genetic target height level. Because the height is not necessarily short at that time, parents often do not pay attention to it and do not consult the doctor, and only come to the doctor when the height no longer grows, losing the best time for treatment. 3. Due to early sexual development, girls have enlarged breasts and early menstruation, boys have enlarged penis and testicles, and even have erections, and are a bit “different” among children of the same age.